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.TH "docker_check" "1" "January 2023" "docker_check" ""
.hy
.SH NAME
.PP
docker_check - Checks a set of docker containers and notifies if their
state is not up and running.
Configuration is done in environment files.
.PD 0
.P
.PD
It\[cq]s part of \f[B]system-helpers\f[R].
.SH SYNOPSIS
.PP
\f[B]docker_check\f[R] [CONFIG_FILE (absolute path)]
.SH DESCRIPTION
.PP
\f[B]docker_check\f[R] checks a list of docker containers and notifies
if their state is not up and running.
It comes with systemd services.
.PP
If no \f[I]CONFIG_FILE\f[R] is provided, \f[B]docker_check\f[R] tries to
read from \f[I]$HOME/.docker_check.conf\f[R] and
\f[I]/etc/docker_check.conf\f[R] for configuration.
It will exit with a non-zero exit code if it cannot find an proper
configuration file.
.PP
The following are at least required for the script to work:
.PD 0
.P
.PD
- \f[B]DOCKER_CHECK_MAIL_ADDRESS=\[lq]\[lq]\f[R] which requires
\f[I]mail.rc\f[R] to be configured and `\f[I]mailx\f[R]' command has be
available.
.PD 0
.P
.PD
- \f[B]DOCKER_CHECK_LIST_FILE=\[lq]$HOME/.docker_check.list\[rq]\f[R]
which lists to be checked docker containers separated by lines.
Provide their container name, e.g.\ output of current running docker
containers piped into the file: \f[I]docker ps \[en]format `{{.Names}}'
>> $HOME/.docker_check.list\f[R]).
.PD 0
.P
.PD
- \f[B]DOCKER_CHECK_NOTIFY_LEVELS=(\[lq]UNKNOWN\[rq] \[lq]WARNING\[rq]
\[lq]CRITICAL\[rq])\f[R] determines when to notify/output/send mail.
Possible: \f[I]\[lq]UNKNOWN\[rq]\f[R] \f[I]\[lq]WARNING\[rq]\f[R]
\f[I]\[lq]CRITICAL\[rq]\f[R] \f[I]\[lq]INFO\[rq]\f[R].
.PD 0
.P
.PD
- \f[B]DOCKER_CHECK_MAIL_ENABLED=false\f[R] enables or disables sending
mail notifications.
.PP
You can copy this script to \f[I]/usr/local/bin\f[R] and use create a
custom \f[B]CONFIG_FILE\f[R] as user.
.SH EXAMPLE
.PP
Create a \f[I]$HOME/.docker_check.conf\f[R] and add
\f[I]DOCKER_CHECK_MAIL_ADDRESS=\[lq]alias\[at]domain.tld\[rq]\f[R].
Notifications will be delivered to alias\[at]domain.tld.
Examples can be found in \f[I]/usr/share/doc/docker_check\f[R].
.SH EXIT VALUES
.TP
\f[B]0\f[R]
Success
.TP
\f[B]1\f[R]
Error
.SH AUTHORS
Alexander Sch\[:a]ferdiek.