53 lines
1.9 KiB
Plaintext
53 lines
1.9 KiB
Plaintext
|
#!/bin/bash
|
||
|
|
# this command helper depends on key-based (passwordless) SSH access by the current user to each of the docker swarm nodes.
|
||
|
|
# usage help.
|
||
|
|
usage()
|
||
|
|
{
|
||
|
|
echo
|
||
|
|
echo "Usage: docker-service-exec [OPTIONS] SERVICE COMMAND [ARG...]"
|
||
|
|
echo
|
||
|
|
echo "Run a command in a running swarm service"
|
||
|
|
echo
|
||
|
|
echo "Options:
|
||
|
|
-i, --interactive Keep STDIN open even if not attached
|
||
|
|
-u, --user string Username or UID (format: <name|uid>[:<group|gid>])
|
||
|
|
-w, --workdir string Working directory inside the container"
|
||
|
|
exit 2
|
||
|
|
}
|
||
|
|
|
||
|
|
# parse the arguments
|
||
|
|
PARSED_ARGUMENTS=$(getopt -q -a -n docker-service-exec -o iu:w: -l interactive,it,user:,workdir: -- "$@")
|
||
|
|
VALID_ARGUMENTS=$?
|
||
|
|
if [ "$VALID_ARGUMENTS" != "0" ]; then
|
||
|
|
usage
|
||
|
|
fi
|
||
|
|
|
||
|
|
# use below for diagnostics only.
|
||
|
|
# echo "PARSED_ARGUMENTS is $PARSED_ARGUMENTS"
|
||
|
|
eval set -- "$PARSED_ARGUMENTS"
|
||
|
|
while :
|
||
|
|
do
|
||
|
|
case "$1" in
|
||
|
|
-i | --it | --interactive) OPT_INTERACTIVE="-it"; shift ;;
|
||
|
|
-u | --user) OPT_USER="-u $2"; shift 2 ;;
|
||
|
|
-w | --workdir) OPT_WORKDIR="-w $2"; shift 2 ;;
|
||
|
|
# -- means the end of the arguments; drop this, and break out of the while loop
|
||
|
|
--) shift; break ;;
|
||
|
|
# If invalid options were passed, then getopt should have reported an error,
|
||
|
|
# which we checked as VALID_ARGUMENTS when getopt was called...
|
||
|
|
*)
|
||
|
|
echo "Unexpected option: $1 - this should not happen."
|
||
|
|
usage;;
|
||
|
|
esac
|
||
|
|
done
|
||
|
|
|
||
|
|
# discover docker server vars.
|
||
|
|
SERVICE_NAME=$1; shift
|
||
|
|
TASK_ID=$(docker service ps --filter 'desired-state=running' $SERVICE_NAME -q)
|
||
|
|
NODE_ID=$(docker inspect --format '{{ .NodeID }}' $TASK_ID)
|
||
|
|
CONTAINER_ID=$(docker inspect --format '{{ .Status.ContainerStatus.ContainerID }}' $TASK_ID)
|
||
|
|
NODE_HOST=$(docker node inspect --format '{{ .Description.Hostname }}' $NODE_ID)
|
||
|
|
# connect to the docker host through SSH
|
||
|
|
export DOCKER_HOST="ssh://$(whoami)@$NODE_HOST.$(hostname -d)"
|
||
|
|
# execute the command
|
||
|
|
docker exec $OPT_INTERACTIVE $OPT_USER $OPT_WORKDIR $CONTAINER_ID "$@"
|