Dockerfile and entrypoint

Dockerfile

+FROM debian:jessie
+MAINTAINER <contato@hacklab.com.br>
+
+ENV DEBIAN_FRONTEND noninteractive
+ENV PXC_HOME="/var/cache/mysql"
+ENV PXC_DATA="/var/lib/mysql"
+ENV PXC_RUN="/var/run/mysqld"
+
+ENV MYSQL_ROOT_PASSWORD="rootpass"
+ENV MYSQL_ALLOW_EMPTY_PASSWORD="no"
+ENV MYSQL_DATABASE="database"
+ENV MYSQL_USER="pxcuser"
+ENV MYSQL_PASSWORD="pxcpass"
+ENV XTRABACKUP_PASSWORD="password"
+ENV MYSQL_LOG_FILE=/var/log/mysqld.log
+
+RUN groupadd -r mysql && useradd -r -m -d "${PXC_HOME}" -g mysql mysql \
+    && apt-get update \
+    && apt-get install -y curl jq \
+    && curl -sLo pxc.deb https://repo.percona.com/apt/percona-release_0.1-5.jessie_all.deb \
+    && dpkg -i pxc.deb \
+    && apt-get update \
+    && apt-get install -y percona-xtradb-cluster-57 \
+    && rm -Rf "${PXC_DATA}" "${PXC_RUN}" \
+    && mkdir -m 755 -p "${PXC_DATA}" "${PXC_RUN}" \
+    && chown -R mysql: "${PXC_DATA}" "${PXC_RUN}" \
+    && rm pxc.deb \
+    && rm /etc/mysql/my.cnf.old
+
+RUN { \
+        echo "[mysqld]"; \
+        echo "server-id=1"; \
+        echo "datadir=${PXC_DATA}"; \
+        echo "log-error=${MYSQL_LOG_FILE}"; \
+        echo "socket=${PXC_RUN}/mysqld.sock"; \
+        echo "pid-file=${PXC_RUN}/mysqld.pid"; \
+        echo "log-bin"; \
+        echo "log_slave_updates"; \
+        echo "default_storage_engine=InnoDB"; \
+        echo "binlog_format=ROW"; \
+        echo "innodb_flush_log_at_trx_commit  = 0"; \
+        echo "innodb_flush_method             = O_DIRECT"; \
+        echo "innodb_file_per_table           = 1"; \
+        echo "innodb_autoinc_lock_mode=2"; \
+        echo "bind_address = 0.0.0.0"; \
+        echo "wsrep_slave_threads=2"; \
+        echo "wsrep_cluster_address=gcomm://"; \
+        echo "wsrep_provider=/usr/lib/galera3/libgalera_smm.so"; \
+        echo "wsrep_cluster_name=Theistareykjarbunga"; \
+        echo "wsrep_sst_method=xtrabackup-v2"; \
+        echo "wsrep_sst_auth=\"root:\""; \
+    } > /etc/mysql/percona-xtradb-cluster.conf.d/mysqld.cnf
+
+VOLUME ["${PXC_DATA}","${PXC_RUN}"]
+EXPOSE 3306 4567 4568
+
+COPY entrypoint /entrypoint
+ENTRYPOINT ["/entrypoint/main.sh"]
+
+CMD ["mysqld", "--user=mysql", "--wsrep_sst_method=xtrabackup-v2"]

entrypoint/bootstrap.sh

+#!/bin/bash
+
+
+bootstrap_sql_timezone () {
+    mysql_tzinfo_to_sql /usr/share/zoneinfo 2>&- \
+        | sed 's/Local time zone must be set--see zic manual page/FCTY/'
+}
+
+bootstrap_sql_root_user () {
+    cat <<-EOSQL
+        -- What's done in this file shouldn't be replicated
+        --  or products like mysql-fabric won't work
+        SET @@SESSION.SQL_LOG_BIN=0;
+        CREATE USER 'root'@'%' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' ;
+        GRANT ALL ON *.* TO 'root'@'%' WITH GRANT OPTION ;
+        ALTER USER 'root'@'localhost' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}';
+        CREATE USER 'xtrabackup'@'localhost' IDENTIFIED BY '${XTRABACKUP_PASSWORD}';
+        GRANT RELOAD,PROCESS,LOCK TABLES,REPLICATION CLIENT ON *.* TO 'xtrabackup'@'localhost';
+        GRANT REPLICATION CLIENT ON *.* TO monitor@'%' IDENTIFIED BY 'monitor';
+        GRANT PROCESS ON *.* TO monitor@localhost IDENTIFIED BY 'monitor';
+        DROP DATABASE IF EXISTS test ;
+        FLUSH PRIVILEGES ;
+EOSQL
+}
+
+bootstrap_sql_database () {
+    printf 'CREATE DATABASE IF NOT EXISTS `%s`;' "$MYSQL_DATABASE"
+    echo ''
+}
+
+bootstrap_sql_user () {
+    printf "CREATE USER '%s'@'%%' IDENTIFIED BY '%s';" "$MYSQL_USER" "$MYSQL_PASSWORD"
+    echo ''
+}
+
+bootstrap_sql_grant_user () {
+    printf "GRANT ALL ON \`%s\`.* TO '%s'@'%%';" "$MYSQL_DATABASE" "$MYSQL_USER"
+    echo 'FLUSH PRIVILEGES;'
+}
+
+bootstrap_database () {
+    sql_file="${PXC_HOME}/bootstrap.sql"
+
+    bootstrap_sql_timezone  >> "$sql_file"
+    bootstrap_sql_root_user >> "$sql_file"
+
+    if [ -n "$MYSQL_DATABASE" ];
+    then
+        bootstrap_sql_database >> "$sql_file"
+    fi
+
+    if [ -n "$MYSQL_USER" ] && [ -n "$MYSQL_PASSWORD" ];
+    then
+        bootstrap_sql_user >> $sql_file
+
+        if [ -n "$MYSQL_DATABASE" ];
+        then
+            bootstrap_sql_grant_user >> "$sql_file"
+        fi
+    fi
+
+    mysql_install_db \
+        --insecure \
+        --user=mysql \
+        --basedir=/usr \
+        --datadir="${PXC_DATA}" \
+        --extra-sql-file="$sql_file"
+
+    rm "$sql_file"
+}

entrypoint/discovery_etcd.sh

+#!/bin/bash
+
+BASE_URL="http://$ETCD_HOST/v2/keys/pxc-cluster"
+MY_IP=$(hostname -i | awk '{ print $1 }')
+TTL=60
+
+register_me_on_queue () {
+    curl -sS "${BASE_URL}/queue/$CLUSTER_NAME" -XPOST -d value=$MY_IP -d ttl=$TTL \
+        | tee /dev/stderr
+        | jq '.'
+}
+
+register_me_on_quorum () {
+    curl -sS "${BASE_URL}/$CLUSTER_NAME/$MY_IP/ipaddr" -XPUT -d value="$MY_IP" -d ttl=$TTL
+    curl -sS "${BASE_URL}/$CLUSTER_NAME/$MY_IP/hostname" -XPUT -d value="$HOSTNAME" -d ttl=$TTL
+    curl -sS "${BASE_URL}/$CLUSTER_NAME/$MY_IP" -XPUT -d ttl=30 -d dir=true -d prevExist=true
+}
+
+get_queue_addresses () {
+    curl -sS "${BASE_URL}/queue/$CLUSTER_NAME" \
+        | jq ".node.nodes[] | select(.value != \"$MY_IP\") .value" \
+        | tee /dev/stderr
+}
+
+get_quorum_addresses () {
+    curl "${BASE_URL}/$CLUSTER_NAME/?quorum=true"
+        | jq -r '.node.nodes[]?.key' \
+        | grep -o '[0-9\.]*$'
+}
+
+get_cluster_addresses () {
+    get_queue_addresses;
+    get_quorum_addresses;
+}

entrypoint/entrypoint.sh

+#!/bin/bash
+
+if [ -z "${CLUSTER_NAME}" ];
+then
+    echo 'Set environment variable CLUSTER_NAME' > /dev/stderr
+    exit 1
+fi
+
+if [ -z "$(ls -A $PXC_DATA)" ];
+then
+    mkdir -m 755 -p "${PXC_DATA}"
+    chown -R mysql: "${PXC_DATA}"
+
+    source /entrypoint/bootstrap.sh;
+    bootstrap_database
+fi
+
+
+exec "$@"

entrypoint/main.sh

+#!/bin/bash
+
+MY_IP=$(hostname -i | awk '{ print $1 }')
+
+if [ -z "${CLUSTER_NAME}" ];
+then
+    echo 'Set environment variable CLUSTER_NAME' > /dev/stderr
+    exit 1
+fi
+
+if [ -z "$(ls -A $PXC_DATA)" ];
+then
+    mkdir -m 755 -p "${PXC_DATA}"
+    chown -R mysql: "${PXC_DATA}"
+
+    source /entrypoint/bootstrap.sh;
+    bootstrap_database
+fi
+
+if [ -z "$CLUSTER_JOIN" ];
+then
+    if [ -n "$ETCD_HOST" ];
+    then
+        source /entrypoint/discovery_etcd.sh
+        register_me_on_queue;
+    fi
+
+    CLUSTER_JOIN=$(get_cluster_addresses | sed -Eze 's/^\s*//;s/\s*$//;s/\s+/,/g')
+    export CLUSTER_JOIN
+fi
+
+if [ "$(basename $1)" = "mysqld" ];
+then
+    rm "${MYSQL_LOG_FILE}"
+    mkfifo -m 777 "${MYSQL_LOG_FILE}"
+    cat "${MYSQL_LOG_FILE}" &
+
+    exec "$@" \
+        --wsrep_cluster_name=$CLUSTER_NAME \
+        --wsrep_cluster_address="gcomm://$CLUSTER_JOIN" \
+        --wsrep_sst_auth="xtrabackup:$XTRABACKUP_PASSWORD" \
+        --wsrep_node_address="$MY_IP"
+else
+    exec "$@"
+fi