[Helper] Cold standby script (WIP, docs incoming)
andryyy
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#!/bin/bash
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export REMOTE_SSH_KEY=/root/.ssh/id_rsa
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export REMOTE_SSH_PORT=22
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export REMOTE_SSH_HOST=my.remote.host
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/opt/mailcow-dockerized/helper-scripts/_cold-standby.sh
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#!/usr/bin/env bash
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PATH=$PATH:/opt/bin
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DATE=$(date +%Y-%m-%d_%H_%M_%S)
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export LC_ALL=C
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echo
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echo "If this script is run automatically by cron or a timer AND you are using block-level snapshots on your backup destination, make sure both do not run at the same time."
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echo "The snapshots of your backup destination should run AFTER the cold standby script finished to ensure consistent snapshots."
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echo
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function docker_garbage() {
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IMGS_TO_DELETE=()
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for container in $(grep -oP "image: \Kmailcow.+" docker-compose.yml); do
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REPOSITORY=${container/:*}
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TAG=${container/*:}
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V_MAIN=${container/*.}
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V_SUB=${container/*.}
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EXISTING_TAGS=$(docker images | grep ${REPOSITORY} | awk '{ print $2 }')
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for existing_tag in ${EXISTING_TAGS[@]}; do
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V_MAIN_EXISTING=${existing_tag/*.}
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V_SUB_EXISTING=${existing_tag/*.}
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# Not an integer
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[[ ! $V_MAIN_EXISTING =~ ^[0-9]+$ ]] && continue
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[[ ! $V_SUB_EXISTING =~ ^[0-9]+$ ]] && continue
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if [[ $V_MAIN_EXISTING == "latest" ]]; then
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echo "Found deprecated label \"latest\" for repository $REPOSITORY, it should be deleted."
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IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
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elif [[ $V_MAIN_EXISTING -lt $V_MAIN ]]; then
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echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
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IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
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elif [[ $V_SUB_EXISTING -lt $V_SUB ]]; then
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echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
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IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
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fi
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done
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done
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if [[ ! -z ${IMGS_TO_DELETE[*]} ]]; then
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docker rmi ${IMGS_TO_DELETE[*]}
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fi
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}
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function preflight_local_checks() {
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if [[ -z "${REMOTE_SSH_KEY}" ]]; then
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echo -e "\e[31mREMOTE_SSH_KEY is not set\e[0m"
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exit 1
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fi
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if [[ ! -s "${REMOTE_SSH_KEY}" ]]; then
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echo -e "\e[31mKeyfile ${REMOTE_SSH_KEY} is empty\e[0m"
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exit 1
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fi
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if [[ $(stat -c "%a" "${REMOTE_SSH_KEY}") -ne 600 ]]; then
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echo -e "\e[31mKeyfile ${REMOTE_SSH_KEY} has insecure permissions\e[0m"
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exit 1
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fi
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if [[ ! -z "${REMOTE_SSH_PORT}" ]]; then
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if [[ ${REMOTE_SSH_PORT} != ?(-)+([0-9]) ]] || [[ ${REMOTE_SSH_PORT} -gt 65535 ]]; then
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echo -e "\e[31mREMOTE_SSH_PORT is set but not an integer < 65535\e[0m"
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exit 1
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fi
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fi
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if [[ -z "${REMOTE_SSH_HOST}" ]]; then
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echo -e "\e[31mREMOTE_SSH_HOST cannot be empty\e[0m"
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exit 1
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fi
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for bin in rsync docker-compose docker grep cut; do
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if [[ -z $(which ${bin}) ]]; then
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echo -e "\e[31mCannot find ${bin} in local PATH, exiting...\e[0m"
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exit 1
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fi
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done
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if grep --help 2>&1 | head -n 1 | grep -q -i "busybox"; then
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echo -e "\e[31mBusyBox grep detected on local system, please install GNU grep\e[0m"
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exit 1
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fi
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}
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function preflight_remote_checks() {
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ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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rsync -V > /dev/null
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if [ $? -ne 0 ]; then
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echo -e "\e[31mCould not verify connection to ${REMOTE_SSH_HOST}\e[0m"
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echo -e "\e[31mPlease check the output above (is rsync >= 3.1.0 installed on the remote system?)\e[0m"
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exit 1
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fi
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if ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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grep --help 2>&1 | head -n 1 | grep -q -i "busybox" ; then
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echo -e "\e[31mBusyBox grep detected on remote system ${REMOTE_SSH_HOST}, please install GNU grep\e[0m"
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exit 1
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fi
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for bin in rsync docker-compose docker; do
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if ! ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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which ${bin} > /dev/null ; then
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echo -e "\e[31mCannot find ${bin} in remote PATH, exiting...\e[0m"
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exit 1
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fi
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done
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}
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preflight_local_checks
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preflight_remote_checks
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SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
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COMPOSE_FILE="${SCRIPT_DIR}/../docker-compose.yml"
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source "${SCRIPT_DIR}/../mailcow.conf"
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CMPS_PRJ=$(echo $COMPOSE_PROJECT_NAME | tr -cd "[A-Za-z-_]")
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SQLIMAGE=$(grep -iEo '(mysql|mariadb)\:.+' "${COMPOSE_FILE}")
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echo
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echo -e "\033[1mFound compose project name ${CMPS_PRJ} for ${MAILCOW_HOSTNAME}\033[0m"
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echo -e "\033[1mFound SQL ${SQLIMAGE}\033[0m"
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echo
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# Make sure destination exists, rsync can fail under some circumstances
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echo -e "\033[1mPreparing remote...\033[0m"
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ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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mkdir -p "${SCRIPT_DIR}/../"
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# Syncing the mailcow base directory
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echo -e "\033[1mSynchronizing mailcow base directory...\033[0m"
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rsync --delete -aH -e "ssh -o StrictHostKeyChecking=no \
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-i \"${REMOTE_SSH_KEY}\" \
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-p ${REMOTE_SSH_PORT}" \
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"${SCRIPT_DIR}/../" root@${REMOTE_SSH_HOST}:"${SCRIPT_DIR}/../"
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# Trigger a Redis save for a consistent Redis copy
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echo -ne "\033[1mRunning redis-cli save... \033[0m"
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docker exec $(docker ps -qf name=redis-mailcow) redis-cli save
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# Syncing volumes related to compose project
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# Same here: make sure destination exists
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for vol in $(docker volume ls -qf name="${CMPS_PRJ}"); do
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mountpoint="$(docker inspect $vol | grep Mountpoint | cut -d '"' -f4)"
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echo -e "\033[1mCreating remote mountpoint ${mountpoint} for ${vol}...\033[0m"
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ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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mkdir -p "${mountpoint}"
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if [[ "${vol}" =~ "mysql-vol-1" ]]; then
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# Make sure a previous backup does not exist
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rm -rf "${SCRIPT_DIR}/../_tmp_mariabackup/"
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echo -e "\033[1mCreating consistent backup for MariaDB volume...\033[0m"
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if ! docker run --rm \
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--network $(docker network ls -qf name=${CMPS_PRJ}_) \
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-v $(docker volume ls -qf name=${CMPS_PRJ}_mysql-vol-1):/var/lib/mysql/:ro \
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--entrypoint= \
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-v "${SCRIPT_DIR}/../_tmp_mariabackup":/backup \
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${SQLIMAGE} mariabackup --host mysql --user root --password ${DBROOT} --backup --target-dir=/backup 2>/dev/null ; then
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echo -e "\e[31mFATAL: mariabackup failed, exiting\e[0m"
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rm -rf "${SCRIPT_DIR}/../_tmp_mariabackup/"
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exit 1
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fi
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if ! docker run --rm \
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--network $(docker network ls -qf name=${CMPS_PRJ}_) \
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--entrypoint= \
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-v "${SCRIPT_DIR}/../_tmp_mariabackup":/backup \
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${SQLIMAGE} mariabackup --prepare --target-dir=/backup 2> /dev/null ; then
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echo -e "\e[31mFATAL: mariabackup failed, exiting\e[0m"
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rm -rf "${SCRIPT_DIR}/../_tmp_mariabackup/"
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exit 1
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fi
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chown -R 999:999 "${SCRIPT_DIR}/../_tmp_mariabackup"
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echo -e "\033[1mSynchronizing MariaDB backup...\033[0m"
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rsync --delete --info=progress2 -aH -e "ssh -o StrictHostKeyChecking=no \
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-i \"${REMOTE_SSH_KEY}\" \
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-p ${REMOTE_SSH_PORT}" \
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"${SCRIPT_DIR}/../_tmp_mariabackup/" root@${REMOTE_SSH_HOST}:"${mountpoint}"
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# Cleanup
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rm -rf "${SCRIPT_DIR}/../_tmp_mariabackup/"
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else
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echo -e "\033[1mSynchronizing ${vol} from local ${mountpoint}...\033[0m"
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rsync --delete --info=progress2 -aH -e "ssh -o StrictHostKeyChecking=no \
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-i \"${REMOTE_SSH_KEY}\" \
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-p ${REMOTE_SSH_PORT}" \
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"${mountpoint}/" root@${REMOTE_SSH_HOST}:"${mountpoint}"
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fi
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echo -e "\e[32mCompleted\e[0m"
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done
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# Restart Dockerd on destination
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echo -ne "\033[1mRestarting Docker daemon on remote to detect new volumes... \033[0m"
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ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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systemctl restart docker
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echo "OK"
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echo -e "\033[1mPulling images on remote...\033[0m"
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ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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docker-compose -f "${SCRIPT_DIR}/../docker-compose.yml" pull --no-parallel
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echo -e "\033[1mForcing garbage cleanup on remote...\033[0m"
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ssh -o StrictHostKeyChecking=no \
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-i "${REMOTE_SSH_KEY}" \
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${REMOTE_SSH_HOST} \
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-p ${REMOTE_SSH_PORT} \
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${SCRIPT_DIR}/../update.sh -f --gc
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echo -e "\e[32mDone\e[0m"
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