This a a nagios/NRPE compatible plugin for checking docker containers. So far you can use it to check
- memory consumption in absolute units (bytes, kb, mb, gb) and as a percentage (0-100%) of the container limit.
- CPU usages as a percentage (0-100%) of container limit.
- automatic restarts performed by the docker daemon
- container status, i.e. is it running?
- container health checks are passing?
- uptime, i.e. is it able to stay running for a long enough time?
- the presence of a container or containers matching specified names
- image version (experimental!), does the running image match that in the remote registry?
This check can communicate with a local docker daemon socket file (default) or with local or remote docker daemons using secure and non-secure TCP connections.
This plugin requires python 3. It is tested on 3.3 and greater but may work on older versions of 3.
With pip
pip3 install check_docker
--or--
pip install check_docker
With curl
curl -o /usr/local/bin/check_docker https://raw.githubusercontent.com/timdaman/check_docker/master/check_docker
chmod a+rx /usr/local/bin/check_docker
With wget
wget -O /usr/local/bin/check_docker https://raw.githubusercontent.com/timdaman/check_docker/master/check_docker
chmod a+rx /usr/local/bin/check_docker
usage: check_docker [-h]
[--connection [/<path to>/docker.socket|<ip/host address>:<port>]
| --secure-connection [<ip/host address>:<port>]]
[--timeout TIMEOUT]
[--containers CONTAINERS [CONTAINERS ...]] [--present]
[--cpu WARN:CRIT] [--memory WARN:CRIT:UNITS]
[--status STATUS] [--health] [--uptime WARN:CRIT]
[--version] [--restarts WARN:CRIT]
Check docker containers.
optional arguments:
-h, --help show this help message and exit
--connection [/<path to>/docker.socket|<ip/host address>:<port>]
Where to find docker daemon socket. (default:
/var/run/docker.sock)
--secure-connection [<ip/host address>:<port>]
Where to find TLS protected docker daemon socket.
--timeout TIMEOUT Connection timeout in seconds. (default: 10.0)
--containers CONTAINERS [CONTAINERS ...]
One or more RegEx that match the names of the
container(s) to check. If omitted all containers are
checked. (default: ['all'])
--present Modifies --containers so that each RegEx must match at
least one container.
--cpu WARN:CRIT Check cpu usage percentage taking into account any
limits. Valid values are 0 - 100.
--memory WARN:CRIT:UNITS
Check memory usage taking into account any limits.
Valid values for units are %,b,k,m,g.
--status STATUS Desired container status (running, exited, etc).
(default: None)
--health Check container's health check status
--uptime WARN:CRIT Minimum container uptime in seconds. Use when
infrequent crashes are tolerated.
--version Check if the running images are the same version as
those in the registry. Useful for finding stale
images. Only works with public registry.
--restarts WARN:CRIT Container restart thresholds.
Gotchas:
- When using this with older versions of docker (I have seen 1.4 and 1.5) –status only supports ‘running’, ‘restarting’, and ‘paused’.
- When no container is specified all containers are checked. Some containers will return critcal status because the selected check(s) require a running container.