NRPE plugin for monitoring Docker containers
This a nagios/NRPE compatible plugin for checking docker containers. So far you can use it to check and alert on
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.
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.
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.
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