66 lines
2.4 KiB
Bash
66 lines
2.4 KiB
Bash
#!/usr/local/bin/dumb-init /bin/sh
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# Script created following HashiCorp's model for Consul:
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# https://github.com/hashicorp/docker-consul/blob/master/0.X/docker-entrypoint.sh
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# Comments in this file originate from the project above, simply replacing 'Consul' with 'Nomad'.
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set -e
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# Note above that we run dumb-init as PID 1 in order to reap zombie processes
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# as well as forward signals to all processes in its session. Normally, sh
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# wouldn't do either of these functions so we'd leak zombies as well as do
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# unclean termination of all our sub-processes.
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# NOMAD_DATA_DIR is exposed as a volume for possible persistent storage. The
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# NOMAD_CONFIG_DIR isn't exposed as a volume but you can compose additional
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# config files in there if you use this image as a base, or use NOMAD_LOCAL_CONFIG
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# below.
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NOMAD_DATA_DIR=/nomad/data
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NOMAD_CONFIG_DIR=/etc/nomad
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# You can also set the NOMAD_LOCAL_CONFIG environment variable to pass some
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# Nomad configuration JSON without having to bind any volumes.
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if [ -n "$NOMAD_LOCAL_CONFIG" ]; then
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echo "$NOMAD_LOCAL_CONFIG" > "$NOMAD_CONFIG_DIR/local.json"
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fi
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# If the user is trying to run Nomad directly with some arguments, then
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# pass them to Nomad.
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if [ "${1:0:1}" = '-' ]; then
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set -- nomad "$@"
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fi
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# Look for Nomad subcommands.
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if [ "$1" = 'agent' ]; then
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shift
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set -- nomad agent \
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-data-dir="$NOMAD_DATA_DIR" \
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-config="$NOMAD_CONFIG_DIR" \
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"$@"
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elif [ "$1" = 'version' ]; then
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# This needs a special case because there's no help output.
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set -- nomad "$@"
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elif nomad --help "$1" 2>&1 | grep -q "nomad $1"; then
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# We can't use the return code to check for the existence of a subcommand, so
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# we have to use grep to look for a pattern in the help output.
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set -- nomad "$@"
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fi
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# If we are running Nomad, make sure it executes as the proper user.
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if [ "$1" = 'nomad' ]; then
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# If the data or config dirs are bind mounted then chown them.
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# Note: This checks for root ownership as that's the most common case.
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if [ "$(stat -c %u /nomad/data)" != "$(id -u root)" ]; then
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chown root:root /etc/nomad
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fi
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# If requested, set the capability to bind to privileged ports before
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# we drop to the non-root user. Note that this doesn't work with all
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# storage drivers (it won't work with AUFS).
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if [ ! -z ${NOMAD+x} ]; then
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setcap "cap_net_bind_service=+ep" /bin/nomad
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fi
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set -- gosu root "$@"
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fi
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exec "$@"
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