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