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WELCOME TO CEPH
See Ceph File System for additional details. Ceph is highly reliable, easy to manage, and free. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. To try Ceph, see our Getting Started guides. To learn more about Ceph, see our Architecture section. CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster. MOUNT.CEPH – MOUNT A CEPH FILE SYSTEM In fact, it is possible to mount a non-authenticated Ceph file system without mount.ceph by specifying monitor address (es) by IP: mount -t ceph 1.2.3.4:/ /mnt/mycephfs. The first argument is the device part of the mount command. It includes host’s socket and path within CephFSthat will be
INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSIUPGRADING CEPH
Starting the upgrade ¶. Before you begin using cephadm to upgrade Ceph, verify that all hosts are currently online and that your cluster is healthy: ceph -s. To upgrade (or downgrade) to a specific release: ceph orch upgrade start --ceph-version . For example, to upgrade to v15.2.1: ceph orch upgrade start --ceph-version 15.2.1.CEPH BLOCK DEVICE
Ceph Block Device. A block is a sequence of bytes (often 512). Block-based storage interfaces are a mature and common way to store data on media including HDDs, SSDs, CDs, floppy disks, and even tape. The ubiquity of block device interfaces is a perfect fit forCEPHADM OPERATIONS
CEPHADM_HOST_CHECK_FAILED¶. One or more hosts have failed the basic cephadm host check, which verifies that (1) the host is reachable and cephadm can be executed there, and (2) that the host satisfies basic prerequisites, like a working container runtime (podman orRGW SERVICE
Deploy RGWs¶. Cephadm deploys radosgw as a collection of daemons that manage a single-cluster deployment or a particular realm and zone in a multisite deployment. (For more information about realms and zones, see Multi-Site.). Note that with cephadm, radosgw daemons are configured via the monitor configuration database instead of via a ceph.conf or the command line.TROUBLESHOOTING
Troubleshooting¶. Sometimes there is a need to investigate why a cephadm command failed or why a specific service no longer runs properly. As cephadm deploys daemons as containers, troubleshooting daemons is slightly different. CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific.WELCOME TO CEPH
See Ceph File System for additional details. Ceph is highly reliable, easy to manage, and free. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. To try Ceph, see our Getting Started guides. To learn more about Ceph, see our Architecture section. CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster. MOUNT.CEPH – MOUNT A CEPH FILE SYSTEM In fact, it is possible to mount a non-authenticated Ceph file system without mount.ceph by specifying monitor address (es) by IP: mount -t ceph 1.2.3.4:/ /mnt/mycephfs. The first argument is the device part of the mount command. It includes host’s socket and path within CephFSthat will be
INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSIUPGRADING CEPH
Starting the upgrade ¶. Before you begin using cephadm to upgrade Ceph, verify that all hosts are currently online and that your cluster is healthy: ceph -s. To upgrade (or downgrade) to a specific release: ceph orch upgrade start --ceph-version . For example, to upgrade to v15.2.1: ceph orch upgrade start --ceph-version 15.2.1.CEPH BLOCK DEVICE
Ceph Block Device. A block is a sequence of bytes (often 512). Block-based storage interfaces are a mature and common way to store data on media including HDDs, SSDs, CDs, floppy disks, and even tape. The ubiquity of block device interfaces is a perfect fit forCEPHADM OPERATIONS
CEPHADM_HOST_CHECK_FAILED¶. One or more hosts have failed the basic cephadm host check, which verifies that (1) the host is reachable and cephadm can be executed there, and (2) that the host satisfies basic prerequisites, like a working container runtime (podman orRGW SERVICE
Deploy RGWs¶. Cephadm deploys radosgw as a collection of daemons that manage a single-cluster deployment or a particular realm and zone in a multisite deployment. (For more information about realms and zones, see Multi-Site.). Note that with cephadm, radosgw daemons are configured via the monitor configuration database instead of via a ceph.conf or the command line.TROUBLESHOOTING
Troubleshooting¶. Sometimes there is a need to investigate why a cephadm command failed or why a specific service no longer runs properly. As cephadm deploys daemons as containers, troubleshooting daemons is slightly different.CEPH BLOCK DEVICE
Ceph Block Device. A block is a sequence of bytes (often 512). Block-based storage interfaces are a mature and common way to store data on media including HDDs, SSDs, CDs, floppy disks, and even tape. The ubiquity of block device interfaces is a perfect fit for PACIFIC — CEPH DOCUMENTATION RBD block storage¶. Image live-migration feature has been extended to support external data sources. Images can now be instantly imported from local files, remote files served over HTTP(S) or remote S3 buckets in raw (rbd export v1) or basic qcow and qcow2 formats. Support for rbd export v2 format, advanced QCOW features and rbd export-diff snapshot differentials is expected in future releases. HARDWARE RECOMMENDATIONS Hardware Recommendations ¶. Hardware Recommendations. Ceph was designed to run on commodity hardware, which makes building and maintaining petabyte-scale data clusters economically feasible. When planning out your cluster hardware, you will need to balance a number of considerations, including failure domains and potential performanceissues.
DEPLOYING A NEW CEPH CLUSTER Further information about cephadm bootstrap¶. The default bootstrap behavior will work for most users. But if you’d like immediately to know more about cephadm bootstrap, read the list below.. Also, you can run cephadm bootstrap-h to see all of cephadm ’s available options.. Larger Ceph clusters perform better when (external to the Ceph cluster) public network traffic is separated from NETWORK CONFIGURATION REFERENCE Network Configuration Reference¶. Network configuration is critical for building a high performance Ceph Storage Cluster.The Ceph Storage Cluster does not perform request routing or dispatching on behalf of the Ceph Client.Instead, Ceph Clients make requests directly to CephOSD Daemons.
CEPHADM OPERATIONS
CEPHADM_HOST_CHECK_FAILED¶. One or more hosts have failed the basic cephadm host check, which verifies that (1) the host is reachable and cephadm can be executed there, and (2) that the host satisfies basic prerequisites, like a working container runtime (podman or BALANCER — CEPH DOCUMENTATION The balancer mode can be changed to crush-compat mode, which is backward compatible with older clients, and will make small changes to the data distribution over time to CEPHADM – MANAGE THE LOCAL CEPHADM HOST cephadm is a command line tool to manage the local host for the cephadm orchestrator. It provides commands to investigate and modify the state of the current host. cephadm is not required on all hosts, but useful when investigating a particular daemon. TROUBLESHOOTING MONITORS Troubleshooting Monitors¶. When a cluster encounters monitor-related troubles there’s a tendency to panic, and sometimes with good reason. Losing one or more monitors doesn’t necessarily mean that your cluster is down, so long as a majority are up, running, and forma quorum.
JOURNAL CONFIG REFERENCE Journal Config Reference. Filestore OSDs use a journal for two reasons: speed and consistency. Note that since Luminous, the BlueStore OSD back end has been preferred and default. This information is provided for pre-existing OSDs and for rare situations where Filestore is preferred for new deployments. Speed: The journal enables the Ceph OSD CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific.INSTALLING CEPH
Other methods¶. ceph-ansible deploys and manages Ceph clusters using Ansible.. ceph-ansible is widely deployed. ceph-ansible is not integrated with the new orchestrator APIs, introduced in Nautlius and Octopus, which means that newer management features and dashboard integration are not available.UPGRADING CEPH
Starting the upgrade ¶. Before you begin using cephadm to upgrade Ceph, verify that all hosts are currently online and that your cluster is healthy: ceph -s. To upgrade (or downgrade) to a specific release: ceph orch upgrade start --ceph-version . For example, to upgrade to v15.2.1: ceph orch upgrade start --ceph-version 15.2.1.OS RECOMMENDATIONS
2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel. 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore. CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster. INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSI CEPH-MGR ADMINISTRATOR’S GUIDE Using modules¶. Use the command ceph mgr module ls to see which modules are available, and which are currently enabled. Enable or disable modules using the commands ceph mgr module enable and ceph mgr module disable respectively.. If a module is enabled then the active ceph-mgr daemon will load and execute it. In the case of modules that provide a service, such as an POOLS — CEPH DOCUMENTATION Pools ¶. Pools are logical partitions for storing objects. When you first deploy a cluster without creating a pool, Ceph uses the default pools for storing data. A pool provides you with: Resilience: You can set how many OSD are allowed to fail without losing data. For replicated pools, it is the desired number of copies/replicas of anobject.
LOGGING AND DEBUGGING Logging and Debugging ¶. Logging and Debugging. Typically, when you add debugging to your Ceph configuration, you do so at runtime. You can also add Ceph debug logging to your Ceph configuration file if you are encountering issues when starting your cluster. You may view Ceph log files under /var/log/ceph (the default location).CEPH ISCSI GATEWAY
Ceph iSCSI Gateway¶. The iSCSI Gateway presents a Highly Available (HA) iSCSI target that exports RADOS Block Device (RBD) images as SCSI disks. The iSCSI protocol allows clients (initiators) to send SCSI commands to storage devices (targets) over a TCP/IP network, enabling clients without native Ceph client support to access Ceph blockstorage.
CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific.INSTALLING CEPH
Other methods¶. ceph-ansible deploys and manages Ceph clusters using Ansible.. ceph-ansible is widely deployed. ceph-ansible is not integrated with the new orchestrator APIs, introduced in Nautlius and Octopus, which means that newer management features and dashboard integration are not available.UPGRADING CEPH
Starting the upgrade ¶. Before you begin using cephadm to upgrade Ceph, verify that all hosts are currently online and that your cluster is healthy: ceph -s. To upgrade (or downgrade) to a specific release: ceph orch upgrade start --ceph-version . For example, to upgrade to v15.2.1: ceph orch upgrade start --ceph-version 15.2.1.OS RECOMMENDATIONS
2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel. 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore. CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster. INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSI CEPH-MGR ADMINISTRATOR’S GUIDE Using modules¶. Use the command ceph mgr module ls to see which modules are available, and which are currently enabled. Enable or disable modules using the commands ceph mgr module enable and ceph mgr module disable respectively.. If a module is enabled then the active ceph-mgr daemon will load and execute it. In the case of modules that provide a service, such as an POOLS — CEPH DOCUMENTATION Pools ¶. Pools are logical partitions for storing objects. When you first deploy a cluster without creating a pool, Ceph uses the default pools for storing data. A pool provides you with: Resilience: You can set how many OSD are allowed to fail without losing data. For replicated pools, it is the desired number of copies/replicas of anobject.
LOGGING AND DEBUGGING Logging and Debugging ¶. Logging and Debugging. Typically, when you add debugging to your Ceph configuration, you do so at runtime. You can also add Ceph debug logging to your Ceph configuration file if you are encountering issues when starting your cluster. You may view Ceph log files under /var/log/ceph (the default location).CEPH ISCSI GATEWAY
Ceph iSCSI Gateway¶. The iSCSI Gateway presents a Highly Available (HA) iSCSI target that exports RADOS Block Device (RBD) images as SCSI disks. The iSCSI protocol allows clients (initiators) to send SCSI commands to storage devices (targets) over a TCP/IP network, enabling clients without native Ceph client support to access Ceph blockstorage.
INSTALLING CEPH
Other methods¶. ceph-ansible deploys and manages Ceph clusters using Ansible.. ceph-ansible is widely deployed. ceph-ansible is not integrated with the new orchestrator APIs, introduced in Nautlius and Octopus, which means that newer management features and dashboard integration are not available. CEPH – CEPH ADMINISTRATION TOOL ceph is a control utility which is used for manual deployment and maintenance of a Ceph cluster. It provides a diverse set of commands that allows deployment of monitors, OSDs, placement groups, MDS and overall maintenance, administration of the cluster. MOUNT.CEPH – MOUNT A CEPH FILE SYSTEM In fact, it is possible to mount a non-authenticated Ceph file system without mount.ceph by specifying monitor address (es) by IP: mount -t ceph 1.2.3.4:/ /mnt/mycephfs. The first argument is the device part of the mount command. It includes host’s socket and path within CephFSthat will be
MANUAL DEPLOYMENT
Manual Deployment ¶. Manual Deployment. All Ceph clusters require at least one monitor, and at least as many OSDs as copies of an object stored on the cluster. Bootstrapping the initial monitor (s) is the first step in deploying a Ceph Storage Cluster. Monitor deployment also sets important criteria for the entire cluster, such as thenumber
LOGGING AND DEBUGGING Logging and Debugging ¶. Logging and Debugging. Typically, when you add debugging to your Ceph configuration, you do so at runtime. You can also add Ceph debug logging to your Ceph configuration file if you are encountering issues when starting your cluster. You may view Ceph log files under /var/log/ceph (the default location).PLACEMENT GROUPS
Autoscaling placement groups¶. Placement groups (PGs) are an internal implementation detail of how Ceph distributes data. You can allow the cluster to either make recommendations or automatically tune PGs based on how the cluster is used by enabling pg-autoscaling.. Each pool in the system has a pg_autoscale_mode property that can be set to off,on, or warn.
HEALTH CHECKS
Overview ¶. There is a finite set of possible health messages that a Ceph cluster can raise – these are defined as health checks which have unique identifiers. The identifier is a terse pseudo-human-readable (i.e. like a variable name) string. It is intended to enable tools (such as UIs) to make sense of health checks, and present them in a JOURNAL CONFIG REFERENCE Journal Config Reference. Filestore OSDs use a journal for two reasons: speed and consistency. Note that since Luminous, the BlueStore OSD back end has been preferred and default. This information is provided for pre-existing OSDs and for rare situations where Filestore is preferred for new deployments. Speed: The journal enables the Ceph OSD BLOCK DEVICE QUICK START On the ceph-client node, map the image to a block device. Use the block device by creating a file system on the ceph-client node. sudo mkfs.ext4 -m0 /dev/rbd/{pool-name}/foo This may take a few moments. Mount the file system on the ceph-client node. Optionally configure the block device to be automatically mapped and mounted at boot (and CEPH-MDS – CEPH METADATA SERVER DAEMON ceph-mds is the metadata server daemon for the Ceph distributed file system. One or more instances of ceph-mds collectively manage the file system namespace, coordinating access to the shared OSD cluster. Each ceph-mds daemon instance should have a unique name.WELCOME TO CEPH
See Ceph File System for additional details. Ceph is highly reliable, easy to manage, and free. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. To try Ceph, see our Getting Started guides. To learn more about Ceph, see our Architecture section. CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific. INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSIOPERATING A CLUSTER
Use verbose logging. (Dev and QA only) Use Valgrind debugging. Execute on all nodes in ceph.conf. Otherwise, it only executes on localhost. Automatically restart daemon if it core dumps. Don’t restart a daemon if it core dumps. Use an alternate configuration file. Start the daemon (s). Stop the daemon (s). CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster.OS RECOMMENDATIONS
2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel. 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore. CEPH-MGR ADMINISTRATOR’S GUIDE Using modules¶. Use the command ceph mgr module ls to see which modules are available, and which are currently enabled. Enable or disable modules using the commands ceph mgr module enable and ceph mgr module disable respectively.. If a module is enabled then the active ceph-mgr daemon will load and execute it. In the case of modules that provide a service, such as an POOLS — CEPH DOCUMENTATION Pools ¶. Pools are logical partitions for storing objects. When you first deploy a cluster without creating a pool, Ceph uses the default pools for storing data. A pool provides you with: Resilience: You can set how many OSD are allowed to fail without losing data. For replicated pools, it is the desired number of copies/replicas of anobject.
POOL PLACEMENT AND STORAGE CLASSES Placement targets control which Pools are associated with a particular bucket. A bucket’s placement target is selected on creation, and cannot be modified. The radosgw-admin bucket stats command will display its placement_rule.. The zonegroup configuration contains a list of placement targets with an initial target named default-placement.The zone configuration then maps each zonegroup JOURNAL CONFIG REFERENCE Journal Config Reference. Filestore OSDs use a journal for two reasons: speed and consistency. Note that since Luminous, the BlueStore OSD back end has been preferred and default. This information is provided for pre-existing OSDs and for rare situations where Filestore is preferred for new deployments. Speed: The journal enables the Ceph OSDWELCOME TO CEPH
See Ceph File System for additional details. Ceph is highly reliable, easy to manage, and free. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. To try Ceph, see our Getting Started guides. To learn more about Ceph, see our Architecture section. CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific. INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSIOPERATING A CLUSTER
Use verbose logging. (Dev and QA only) Use Valgrind debugging. Execute on all nodes in ceph.conf. Otherwise, it only executes on localhost. Automatically restart daemon if it core dumps. Don’t restart a daemon if it core dumps. Use an alternate configuration file. Start the daemon (s). Stop the daemon (s). CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster.OS RECOMMENDATIONS
2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel. 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore. CEPH-MGR ADMINISTRATOR’S GUIDE Using modules¶. Use the command ceph mgr module ls to see which modules are available, and which are currently enabled. Enable or disable modules using the commands ceph mgr module enable and ceph mgr module disable respectively.. If a module is enabled then the active ceph-mgr daemon will load and execute it. In the case of modules that provide a service, such as an POOLS — CEPH DOCUMENTATION Pools ¶. Pools are logical partitions for storing objects. When you first deploy a cluster without creating a pool, Ceph uses the default pools for storing data. A pool provides you with: Resilience: You can set how many OSD are allowed to fail without losing data. For replicated pools, it is the desired number of copies/replicas of anobject.
POOL PLACEMENT AND STORAGE CLASSES Placement targets control which Pools are associated with a particular bucket. A bucket’s placement target is selected on creation, and cannot be modified. The radosgw-admin bucket stats command will display its placement_rule.. The zonegroup configuration contains a list of placement targets with an initial target named default-placement.The zone configuration then maps each zonegroup JOURNAL CONFIG REFERENCE Journal Config Reference. Filestore OSDs use a journal for two reasons: speed and consistency. Note that since Luminous, the BlueStore OSD back end has been preferred and default. This information is provided for pre-existing OSDs and for rare situations where Filestore is preferred for new deployments. Speed: The journal enables the Ceph OSD CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific.CONFIGURING CEPH
Configuring Ceph¶. When Ceph services start, the initialization process activates a series of daemons that run in the background. A Ceph Storage Cluster runs at a minimum three types of daemons:. Ceph Monitor (ceph-mon). Ceph Manager (ceph-mgr). Ceph OSD Daemon (ceph-osd). Ceph Storage Clusters that support the Ceph File System also run at least one Ceph Metadata Server (ceph-mds).OPERATING A CLUSTER
Use verbose logging. (Dev and QA only) Use Valgrind debugging. Execute on all nodes in ceph.conf. Otherwise, it only executes on localhost. Automatically restart daemon if it core dumps. Don’t restart a daemon if it core dumps. Use an alternate configuration file. Start the daemon (s). Stop the daemon (s).UPGRADING CEPH
Starting the upgrade ¶. Before you begin using cephadm to upgrade Ceph, verify that all hosts are currently online and that your cluster is healthy: ceph -s. To upgrade (or downgrade) to a specific release: ceph orch upgrade start --ceph-version . For example, to upgrade to v15.2.1: ceph orch upgrade start --ceph-version 15.2.1. MULTI-SITE — CEPH DOCUMENTATION However, Kraken supports several multi-site configuration options for the Ceph Object Gateway: Multi-zone: A more advanced configuration consists of one zone group and multiple zones, each zone with one or more ceph-radosgw instances. Each zone is backed by its own Ceph Storage Cluster. Multiple zones in a zone group provides disasterrecovery
CEPH-DEPLOY
Description¶. ceph-deploy is a tool which allows easy and quick deployment of a Ceph cluster without involving complex and detailed manual configuration. It uses ssh to gain access to other Ceph nodes from the admin node, sudo for administrator privileges on them and the underlying Python scripts automates the manual process of Ceph installation on each node from the admin node itself.GET PACKAGES
Get Packages ¶. Get Packages. To install Ceph and other enabling software, you need to retrieve packages from the Ceph repository. There are three ways to get packages: Cephadm: Cephadm can configure your Ceph repositories for you based on a release name or a specific Ceph version. Each Ceph Node in your cluster must have internetaccess.
TROUBLESHOOTING OSDS Troubleshooting OSDs¶. Before troubleshooting your OSDs, first check your monitors and network. If you execute ceph health or ceph-s on the command line and Ceph shows HEALTH_OK, it means that the monitors have a quorum.If you don’t have a monitor quorum or if there are errors with the monitor status, address the monitor issues first.Check your networks to ensure they are running properly BLOCK DEVICE QUICK START On the ceph-client node, map the image to a block device. Use the block device by creating a file system on the ceph-client node. sudo mkfs.ext4 -m0 /dev/rbd/{pool-name}/foo This may take a few moments. Mount the file system on the ceph-client node. Optionally configure the block device to be automatically mapped and mounted at boot (and RGW DYNAMIC BUCKET INDEX RESHARDING RGW Dynamic Bucket Index Resharding. New in version Luminous. A large bucket index can lead to performance problems. In order to address this problem we introduced bucket index sharding. Until Luminous, changing the number of bucket shards (resharding) needed to be done offline. Starting with Luminous we support online bucket resharding.WELCOME TO CEPH
See Ceph File System for additional details. Ceph is highly reliable, easy to manage, and free. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. To try Ceph, see our Getting Started guides. To learn more about Ceph, see our Architecture section. CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific. INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSIOPERATING A CLUSTER
Use verbose logging. (Dev and QA only) Use Valgrind debugging. Execute on all nodes in ceph.conf. Otherwise, it only executes on localhost. Automatically restart daemon if it core dumps. Don’t restart a daemon if it core dumps. Use an alternate configuration file. Start the daemon (s). Stop the daemon (s). CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster.OS RECOMMENDATIONS
2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel. 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore. CEPH-MGR ADMINISTRATOR’S GUIDE Using modules¶. Use the command ceph mgr module ls to see which modules are available, and which are currently enabled. Enable or disable modules using the commands ceph mgr module enable and ceph mgr module disable respectively.. If a module is enabled then the active ceph-mgr daemon will load and execute it. In the case of modules that provide a service, such as an POOLS — CEPH DOCUMENTATION Pools ¶. Pools are logical partitions for storing objects. When you first deploy a cluster without creating a pool, Ceph uses the default pools for storing data. A pool provides you with: Resilience: You can set how many OSD are allowed to fail without losing data. For replicated pools, it is the desired number of copies/replicas of anobject.
POOL PLACEMENT AND STORAGE CLASSES Placement targets control which Pools are associated with a particular bucket. A bucket’s placement target is selected on creation, and cannot be modified. The radosgw-admin bucket stats command will display its placement_rule.. The zonegroup configuration contains a list of placement targets with an initial target named default-placement.The zone configuration then maps each zonegroup JOURNAL CONFIG REFERENCE Journal Config Reference. Filestore OSDs use a journal for two reasons: speed and consistency. Note that since Luminous, the BlueStore OSD back end has been preferred and default. This information is provided for pre-existing OSDs and for rare situations where Filestore is preferred for new deployments. Speed: The journal enables the Ceph OSDWELCOME TO CEPH
See Ceph File System for additional details. Ceph is highly reliable, easy to manage, and free. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. To try Ceph, see our Getting Started guides. To learn more about Ceph, see our Architecture section. CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific. INSTALLING CEPH ON WINDOWS Installing Ceph on Windows¶. The Ceph client tools and libraries can be natively used on Windows. This avoids the need of having additional layers such as iSCSIOPERATING A CLUSTER
Use verbose logging. (Dev and QA only) Use Valgrind debugging. Execute on all nodes in ceph.conf. Otherwise, it only executes on localhost. Automatically restart daemon if it core dumps. Don’t restart a daemon if it core dumps. Use an alternate configuration file. Start the daemon (s). Stop the daemon (s). CEPHADM — CEPH DOCUMENTATION Cephadm ¶. Cephadm. cephadm deploys and manages a Ceph cluster. It does this by connecting the manager daemon to hosts via SSH. The manager daemon is able to add, remove, and update Ceph containers. cephadm does not rely on external configuration tools such as Ansible, Rook, and Salt. cephadm manages the full lifecycle of a Ceph cluster.OS RECOMMENDATIONS
2: The default kernel has an old Ceph client that we do not recommend for kernel client (kernel RBD or the Ceph file system). Upgrade to a recommended kernel. 3: The default kernel regularly fails in QA when the Btrfs file system is used. We recommend using BlueStore starting from Luminous, and XFS for previous releases with Filestore. CEPH-MGR ADMINISTRATOR’S GUIDE Using modules¶. Use the command ceph mgr module ls to see which modules are available, and which are currently enabled. Enable or disable modules using the commands ceph mgr module enable and ceph mgr module disable respectively.. If a module is enabled then the active ceph-mgr daemon will load and execute it. In the case of modules that provide a service, such as an POOLS — CEPH DOCUMENTATION Pools ¶. Pools are logical partitions for storing objects. When you first deploy a cluster without creating a pool, Ceph uses the default pools for storing data. A pool provides you with: Resilience: You can set how many OSD are allowed to fail without losing data. For replicated pools, it is the desired number of copies/replicas of anobject.
POOL PLACEMENT AND STORAGE CLASSES Placement targets control which Pools are associated with a particular bucket. A bucket’s placement target is selected on creation, and cannot be modified. The radosgw-admin bucket stats command will display its placement_rule.. The zonegroup configuration contains a list of placement targets with an initial target named default-placement.The zone configuration then maps each zonegroup JOURNAL CONFIG REFERENCE Journal Config Reference. Filestore OSDs use a journal for two reasons: speed and consistency. Note that since Luminous, the BlueStore OSD back end has been preferred and default. This information is provided for pre-existing OSDs and for rare situations where Filestore is preferred for new deployments. Speed: The journal enables the Ceph OSD CEPH RELEASES (INDEX) The following Ceph releases are actively maintained and receive periodic backports and security fixes. Name. Initial release. Latest. End of life (estimated) Pacific.CONFIGURING CEPH
Configuring Ceph¶. When Ceph services start, the initialization process activates a series of daemons that run in the background. A Ceph Storage Cluster runs at a minimum three types of daemons:. Ceph Monitor (ceph-mon). Ceph Manager (ceph-mgr). Ceph OSD Daemon (ceph-osd). Ceph Storage Clusters that support the Ceph File System also run at least one Ceph Metadata Server (ceph-mds).OPERATING A CLUSTER
Use verbose logging. (Dev and QA only) Use Valgrind debugging. Execute on all nodes in ceph.conf. Otherwise, it only executes on localhost. Automatically restart daemon if it core dumps. Don’t restart a daemon if it core dumps. Use an alternate configuration file. Start the daemon (s). Stop the daemon (s).UPGRADING CEPH
Starting the upgrade ¶. Before you begin using cephadm to upgrade Ceph, verify that all hosts are currently online and that your cluster is healthy: ceph -s. To upgrade (or downgrade) to a specific release: ceph orch upgrade start --ceph-version . For example, to upgrade to v15.2.1: ceph orch upgrade start --ceph-version 15.2.1. MULTI-SITE — CEPH DOCUMENTATION However, Kraken supports several multi-site configuration options for the Ceph Object Gateway: Multi-zone: A more advanced configuration consists of one zone group and multiple zones, each zone with one or more ceph-radosgw instances. Each zone is backed by its own Ceph Storage Cluster. Multiple zones in a zone group provides disasterrecovery
CEPH-DEPLOY
Description¶. ceph-deploy is a tool which allows easy and quick deployment of a Ceph cluster without involving complex and detailed manual configuration. It uses ssh to gain access to other Ceph nodes from the admin node, sudo for administrator privileges on them and the underlying Python scripts automates the manual process of Ceph installation on each node from the admin node itself.GET PACKAGES
Get Packages ¶. Get Packages. To install Ceph and other enabling software, you need to retrieve packages from the Ceph repository. There are three ways to get packages: Cephadm: Cephadm can configure your Ceph repositories for you based on a release name or a specific Ceph version. Each Ceph Node in your cluster must have internetaccess.
TROUBLESHOOTING OSDS Troubleshooting OSDs¶. Before troubleshooting your OSDs, first check your monitors and network. If you execute ceph health or ceph-s on the command line and Ceph shows HEALTH_OK, it means that the monitors have a quorum.If you don’t have a monitor quorum or if there are errors with the monitor status, address the monitor issues first.Check your networks to ensure they are running properly BLOCK DEVICE QUICK START On the ceph-client node, map the image to a block device. Use the block device by creating a file system on the ceph-client node. sudo mkfs.ext4 -m0 /dev/rbd/{pool-name}/foo This may take a few moments. Mount the file system on the ceph-client node. Optionally configure the block device to be automatically mapped and mounted at boot (and RGW DYNAMIC BUCKET INDEX RESHARDING RGW Dynamic Bucket Index Resharding. New in version Luminous. A large bucket index can lead to performance problems. In order to address this problem we introduced bucket index sharding. Until Luminous, changing the number of bucket shards (resharding) needed to be done offline. Starting with Luminous we support online bucket resharding.Menu
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