sync.dds

Simplest configuration:

[sync#0]
type = dds
dst = foo
src = foo
target = foo

svcmgr -s <svcname> set --kw sync#0.type=dds --kw sync#0.dst=foo --kw sync#0.src=foo --kw sync#0.target=foo

dst

scopable	True
required	True
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

Target file or block device. Optional. Defaults to src. Points the media to replay the binary-delta received from source node to. This media must have a size superior or equal to source.

snap_size

scopable	False
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

Default to 10% of origin. In MB, rounded to physical extent boundaries by lvm tools. Size of the snapshots created by OpenSVC to extract binary deltas from. Opensvc creates at most 2 snapshots : one short-lived to gather changed data from, and one long-lived to gather changed chunks list from. Volume groups should have the necessary space always available.

src

scopable	False
required	True
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

Points the origin of the snapshots to replicate from.

target

scopable	False
required	True
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic
candidates	nodes | drpnodes
convert	list

Accepted values are drpnodes, nodes or both, whitespace-separated. Points the target nodes to replay the binary-deltas on. Be warned that starting the service on a target node without a stop-sync_update-start cycle, will break the synchronization, so this mode is usually restricted to drpnodes sync, and should not be used to replicate data between nodes with automated services failover.

blocking_post_provision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource provision action. Errors interrupt the action.

blocking_post_start

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource start action. Errors interrupt the action.

blocking_post_startstandby

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource startstandby action. Errors interrupt the action.

blocking_post_stop

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource stop action. Errors interrupt the action.

blocking_post_sync_drp

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_drp action. Errors interrupt the action.

blocking_post_sync_nodes

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_nodes action. Errors interrupt the action.

blocking_post_sync_restore

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_restore action. Errors interrupt the action.

blocking_post_sync_resync

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_resync action. Errors interrupt the action.

blocking_post_sync_update

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_update action. Errors interrupt the action.

blocking_post_unprovision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource unprovision action. Errors interrupt the action.

blocking_pre_provision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource provision action. Errors interrupt the action.

blocking_pre_start

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource start action. Errors interrupt the action.

blocking_pre_startstandby

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource startstandby action. Errors interrupt the action.

blocking_pre_stop

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource stop action. Errors interrupt the action.

blocking_pre_sync_drp

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_drp action. Errors interrupt the action.

blocking_pre_sync_nodes

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_nodes action. Errors interrupt the action.

blocking_pre_sync_restore

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_restore action. Errors interrupt the action.

blocking_pre_sync_resync

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_resync action. Errors interrupt the action.

blocking_pre_sync_update

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_update action. Errors interrupt the action.

blocking_pre_unprovision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource unprovision action. Errors interrupt the action.

comment

scopable	False
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

Helps users understand the role of the service and resources, which is nice to on-call support people having to operate on a service they are not usually responsible for.

disable

scopable	True
required	False
provisioning	False
default	False
inheritance	leaf
scope order	specific > generic
candidates	True | False
convert	boolean

A disabled resource will be ignored on service startup and shutdown. Its status is always reported n/a.

Set in DEFAULT, the whole service is disabled. A disabled service does not honor start and stop actions. These actions immediately return success.

om <path> disable only sets DEFAULT.disable. As resources disabled state is not changed, om <path> enable does not enable disabled resources.

encap

scopable	True
required	False
provisioning	False
default	False
inheritance	leaf > head
scope order	specific > generic
candidates	True | False
convert	boolean

Set to true to ignore this resource in the nodes context and consider it in the encapnodes context. The resource is thus handled by the agents deployed in the service containers.

monitor

scopable	True
required	False
provisioning	False
default	False
inheritance	leaf > head
scope order	specific > generic
candidates	True | False
convert	boolean

A down monitored resource will trigger a node suicide if the monitor thinks it should be up and the resource can not be restarted.

optional

scopable	True
required	False
provisioning	False
default	true for tasks, syncs and resources tagged “noaction”, else false
inheritance	leaf > head
scope order	specific > generic
convert	tristate

Action failures on optional resources are logged but do not stop the action sequence. Also the optional resource status is not aggregated to the instance “availstatus”, but aggregated to the “overallstatus”. Resource tagged noaction and sync resources are automatically considered optional. Useful for resources like dump filesystems for example.

pg_blkio_weight

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]
convert	integer

Block IO relative weight. Value: between 10 and 1000. Kernel default: 1000.

pg_cpu_quota

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]

The percent ratio of one core to allocate to the process group if % is specified, else the absolute value to set in the process group parameter. For example, on Linux cgroups, -1 means unlimited, and a positive absolute value means the number of microseconds to allocate each period. 50%@all means 50% of all cores, and 50%@2 means 50% of two cores.

pg_cpu_shares

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]
convert	integer

Kernel default value is used, which usually is 1024 shares. In a cpu-bound situation, ensure the service does not use more than its share of cpu ressource. The actual percentile depends on shares allowed to other services.

pg_cpus

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]

Allow service process to bind only the specified cpus. Cpus are specified as list or range : 0,1,2 or 0-2

pg_mem_limit

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]
convert	size

Ensures the service does not use more than specified memory (in bytes). The Out-Of-Memory killer get triggered in case of tresspassing.

pg_mem_oom_control

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]
convert	integer

A flag (0 or 1) that enables or disables the Out of Memory killer for a cgroup. If enabled (0), tasks that attempt to consume more memory than they are allowed are immediately killed by the OOM killer. The OOM killer is enabled by default in every cgroup using the memory subsystem; to disable it, write 1.

pg_mem_swappiness

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]
convert	integer

Set a swappiness value for the process group.

pg_mems

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]

Allow service process to bind only the specified memory nodes. Memory nodes are specified as list or range : 0,1,2 or 0-2

pg_vmem_limit

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic
depends	create_pg in [True]
convert	size

Ensures the service does not use more than specified memory+swap (in bytes). The Out-Of-Memory killer get triggered in case of tresspassing. The specified value must be greater than pg_mem_limit.

post_provision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource provision action. Errors do not interrupt the action.

post_start

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource start action. Errors do not interrupt the action.

post_startstandby

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource startstandby action. Errors do not interrupt the action.

post_stop

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource stop action. Errors do not interrupt the action.

post_sync_drp

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_drp action. Errors do not interrupt the action.

post_sync_nodes

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_nodes action. Errors do not interrupt the action.

post_sync_restore

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_restore action. Errors do not interrupt the action.

post_sync_resync

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_resync action. Errors do not interrupt the action.

post_sync_update

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource sync_update action. Errors do not interrupt the action.

post_unprovision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute after the resource unprovision action. Errors do not interrupt the action.

pre_provision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource provision action. Errors do not interrupt the action.

pre_start

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource start action. Errors do not interrupt the action.

pre_startstandby

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource startstandby action. Errors do not interrupt the action.

pre_stop

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource stop action. Errors do not interrupt the action.

pre_sync_drp

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_drp action. Errors do not interrupt the action.

pre_sync_nodes

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_nodes action. Errors do not interrupt the action.

pre_sync_restore

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_restore action. Errors do not interrupt the action.

pre_sync_resync

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_resync action. Errors do not interrupt the action.

pre_sync_update

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource sync_update action. Errors do not interrupt the action.

pre_unprovision

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic

A command or script to execute before the resource unprovision action. Errors do not interrupt the action.

provision

scopable	True
required	False
provisioning	False
default	True
inheritance	leaf > head
scope order	specific > generic
candidates	True | False
convert	boolean

Set to false to skip the resource on provision and unprovision actions. Warning: Provision implies destructive operations like formating. Unprovision destroys service data.

provision_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “provision” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

restart

scopable	True
required	False
provisioning	False
default	0
inheritance	leaf > head
scope order	specific > generic
convert	integer

The agent will try to restart a resource <n> times before falling back to the monitor action. A resource restart is triggered if :the resource is not disabled and its status is not up, and the node is not frozen, and the service instance is not frozen and its local expect is set to started. If a resource has a restart set to a value >0, its status is evaluated at the frequency defined by DEFAULT.monitor_schedule instead of the frequency defined by DEFAULT.status_schedule. restart_delay defines the interval between two restarts. Standby resources have a particular value to ensure best effort to restart standby resources, default value is 2, and value lower than 2 are changed to 2.

restart_delay

scopable	True
required	False
provisioning	False
default	0
inheritance	leaf > head
scope order	specific > generic
convert	duration

Define minimum delay between two triggered restarts of a same resource (used when :kw:`restart`is defined). Default value is 0 (no delay).

schedule

Set the this resource synchronization schedule. See /usr/share/doc/opensvc/schedule for the schedule syntax reference.

shared

scopable	True
required	False
provisioning	False
default	False
inheritance	leaf > head
scope order	specific > generic
candidates	True | False
convert	boolean

Set to true to skip the resource on provision and unprovision actions if the action has already been done by a peer. Shared resources, like vg built on SAN disks must be provisioned once. All resources depending on a shared resource must also be flagged as shared.

standby

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf > head
scope order	specific > generic
convert	tristate

Always start the resource, even on standby instances. The daemon is responsible for starting standby resources. A resource can be set standby on a subset of nodes using keyword scoping.

A typical use-case is sync’ed fs on non-shared disks: the remote fs must be mounted to not overflow the underlying fs.

Avertissement

Don’t set shared resources standby: fs on shared disks for example.

start_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “start” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

stop_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “stop” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

subset

scopable	True
required	False
provisioning	False
default	None
inheritance	leaf
scope order	specific > generic

Assign the resource to a specific subset.

sync_break_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “sync_break” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

sync_drp_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “sync_drp” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

sync_max_delay

scopable	False
required	False
provisioning	False
default	1d3h
inheritance	leaf > head
scope order	specific > generic
convert	duration_minute

Unit is minutes. This sets to delay above which the sync status of the resource is to be considered down. Should be set according to your application service level agreement. The scheduler task frequency should be set between sync_min_delay and sync_max_delay.

sync_nodes_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “sync_nodes” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

sync_restore_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “sync_restore” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

sync_resync_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “sync_resync” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

sync_update_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “sync_update” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.

tags

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic
convert	set

A list of tags. Arbitrary tags can be used to limit action scope to resources with a specific tag. Some tags can influence the driver behaviour. For example noaction avoids any state changing action from the driver and implies optional=true, nostatus forces the status to n/a.

unprovision

scopable	True
required	False
provisioning	False
default	True
inheritance	leaf > head
scope order	specific > generic
candidates	True | False
convert	boolean

Set to false to skip the resource on unprovision actions. Warning: Unprovision destroys service data.

unprovision_requires

scopable	True
required	False
provisioning	False
default
inheritance	leaf > head
scope order	specific > generic

A whitespace-separated list of conditions to meet to accept running a “unprovision” action. A condition is expressed as <rid>(<state>,...). If states are omitted, up,stdby up is used as the default expected states.