minitor-go/scripts/docker_healthcheck.sh
Ian Fijolek 0a5be250b5 Scripts: Add echoing log lines to helper scripts
Rather than only returning the status of whether or not a container is
healhthy, the helper scripts will now optionally echo some of the latest
log lines.
2020-11-16 15:52:21 -08:00

74 lines
1.8 KiB
Bash
Executable File

#! /bin/bash
set -e
#################
# docker_healthcheck.sh
#
# Returns the results of a Docker Healthcheck for a container
#################
# Docker host will default to a socket
# To override, export DOCKER_HOST to a new hostname
DOCKER_HOST="${DOCKER_HOST:=socket}"
container_name="$1"
num_log_lines="$2"
# Curls Docker either using a socket or URL
function curl_docker {
local path="$1"
if [ "$DOCKER_HOST" == "socket" ]; then
curl --unix-socket /var/run/docker.sock "http://localhost/$path" 2>/dev/null
else
curl "http://${DOCKER_HOST}/$path" 2>/dev/null
fi
}
# Returns caintainer ID for a given container name
function get_container_id {
local container_name="$1"
curl_docker 'containers/json?all=1' \
| jq -r ".[] | {Id, Name: .Names[]} | select(.Name == \"/${container_name}\") | .Id"
}
# Returns container JSON
function inspect_container {
local container_id="$1"
curl_docker "containers/$container_id/json"
}
# Gets some lines from docker log
function get_logs {
container_id="$1"
num_lines="$2"
curl_docker "containers/$container_id/logs?stdout=1&stderr=1" | tail -n "$num_lines"
}
if [ -z "$container_name" ]; then
echo "Usage: $0 container_name [num_log_lines]"
echo "Will return results of healthcheck for continer with provided name"
exit 1
fi
container_id=$(get_container_id "$container_name")
if [ -z "$container_id" ]; then
echo "ERROR: Could not find container with name: $container_name"
exit 1
fi
health=$(inspect_container "$container_id" | jq -r '.State.Health.Status')
if [ -n "$num_log_lines" ]; then
get_logs "$container_id" "$num_log_lines"
fi
case "$health" in
null)
echo "No healthcheck results"
;;
starting|healthy)
echo "Status: '$health'"
;;
*)
echo "Status: '$health'"
exit 1
esac