Prepare for public release

2023-02-08 13:46:00 -06:00
commit de73b968bc
15 changed files with 250 additions and 0 deletions
@@ -0,0 +1,53 @@
+#!/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 $CONTAINER_ID "$@"