Ubuntu Manpage: harep - Ganeti auto-repair tool

Provided by: ganeti-htools_2.9.3-1_amd64

NAME

       harep - Ganeti auto-repair tool

SYNOPSIS

       harep [ [-L | --luxi ] = socket ] [ --job-delay = seconds ]

       harep --version

DESCRIPTION

Harep is the Ganeti auto-repair tool. It is able to detect that an instance is broken and
to generate a sequence of jobs that will fix it, in accordance to the policies set by the
administrator.

Harep is able to recognize what state an instance is in (healthy, suspended, needs repair,
repair disallowed, pending repair, repair disallowed, repair failed) and to lead it
through a sequence of steps that will bring the instance back to the healthy state.
Therefore, harep is mainly meant to be run regularly and frequently using a cron job, so
that is can actually follow the instance along all the process. At every run, harep will
update the tags it adds to instances that describe its repair status, and will submit jobs
that actually perform the required repair operations.

By default, harep only reports on the health status of instances, but doesn't perform any
action, as they might be potentially dangerous. Therefore, harep will only touch
instances that it has been explicitly authorized to work on.

The tags enabling harep, can be associated to single instances, or to a nodegroup or to
the whole cluster, therefore affecting all the instances they contain. The possible tags
share the common structure:

ganeti:watcher:autorepair:<type>

where <type> can have the following values:

• fix-storage: allow disk replacement or fix the backend without affecting the instance
itself (broken DRBD secondary)

• migrate: allow instance migration

• failover: allow instance reboot on the secondary

• reinstall: allow disks to be recreated and the instance to be reinstalled

Each element in the list of tags, includes all the authorizations of the previous one,
with fix-storage being the least powerful and reinstall being the most powerful.

In case multiple autorepair tags act on the same instance, only one can actually be
active. The conflict is solved according to the following rules:

1. if multiple tags are in the same object, the least destructive takes precedence.

2. if the tags are across objects, the nearest tag wins.

Example: A cluster has instances I1 and I2, where I1 has the failover tag, and the cluster
has both fix-storage and reinstall. The I1 instance will be allowed to failover, the I2
instance only to fix-storage.

OPTIONS

       The options that can be passed to the program are as follows:

       -L socket, --luxi=socket
              collect data via Luxi, optionally using the given socket path.

       --job-delay=seconds
              insert this much delay before the execution of repair jobs to  allow  the  tool  to
              continue processing instances.

REPORTING BUGS

       Report   bugs   to  project  website  (http://code.google.com/p/ganeti/)  or  contact  the
       developers using the Ganeti mailing list (ganeti@googlegroups.com).

       Ganeti overview and specifications: ganeti(7) (general  overview),  ganeti-os-interface(7)
       (guest OS definitions), ganeti-extstorage-interface(7) (external storage providers).

       Ganeti   commands:   gnt-cluster(8)   (cluster-wide   commands),  gnt-job(8)  (job-related
       commands), gnt-node(8) (node-related commands), gnt-instance(8) (instance commands),  gnt-
       os(8)  (guest  OS  commands),  gnt-storage(8) (storage commands), gnt-group(8) (node group
       commands), gnt-backup(8) (instance import/export commands), gnt-debug(8) (debug commands).

       Ganeti daemons: ganeti-watcher(8) (automatic instance restarter),  ganeti-cleaner(8)  (job
       queue  cleaner), ganeti-noded(8) (node daemon), ganeti-masterd(8) (master daemon), ganeti-
       rapi(8) (remote API daemon).

       Ganeti htools: htools(1) (generic binary), hbal(1) (cluster balancer), hspace(1) (capacity
       calculation),  hail(1) (IAllocator plugin), hscan(1) (data gatherer from remote clusters),
       hinfo(1) (cluster information printer), mon-collector(7) (data collectors interface).

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