add new mariadb 10.4

docker/mariadb/10.4/Dockerfile

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+FROM alpine:3.11
+
+RUN apk --update --no-cache add mariadb mariadb-client mariadb-server-utils
+COPY start.sh /start.sh
+
+EXPOSE 3306
+
+CMD ./start.sh
+

docker/mariadb/10.4/README.md

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+Build with `docker build -t mariadb:alpine-10.4 .`
+
+Start with `docker run -d -p 3306:3306 --name mariadb mariadb:alpine-10.4`
+
+Or with persistence shared folder with host: `docker run -ti --name mariadb -v $(pwd)/test:/var/lib/mysql/ -p 3306:3306 mariadb:alpine-10.4`
+
+Init with
+
+```
+docker exec -ti mariadb mysql -e "create user 'm'@'%' identified by 'nomysql1';"
+docker exec -ti mariadb mysql -e "grant all privileges on *.* to 'm'@'%' with grant option;"
+```
+
+# option
+
+to enable slow_query_log, use `-e SLOW_LOG=true`.  
+Log location is `/var/lib/mysql/slow_query.log`.
+
+to set mariadb into read only mode, use `-e READ_ONLY="--read-only"`.
+
+server id can be set with `-e SERVER_ID=10`.
+
+Query Cache can be enabled with `-e QUERY_CACHE=ON`.
+
+Max allow packets with `-e MAX_ALLOW_PACKET=64M`.  
+
+Max connections with `-e MAX_CONNECTIONS=500`
+
+# create replica from writer node
+
+#### 1. create replica user
+
+```sql
+CREATE USER 'repl'@'%' IDENTIFIED BY 'repl';
+GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';
+```
+
+#### 2. dump
+
+```
+docker exec -ti mariadb mysqldump --master-data=1 --single-transaction --flush-privileges --routines --triggers --all-databases > writer_dump.sql
+```
+
+and mv `writer_dump.sql` into volume/mount of read replica.  
+
+#### 3. create read replica
+
+grep informations about bin log position
+
+```
+grep "CHANGE MASTER TO MASTER_LOG_FILE" data/writer_dump.sql |head -n 1
+CHANGE MASTER TO MASTER_LOG_FILE='77abd7ecc317-bin.000001', MASTER_LOG_POS=39867;
+```
+
+start read replica
+
+```
+docker run -d --rm -v $(pwd)/data:/var/lib/mysql/  --name mariadb-ro -e READ_ONLY="--read-only" --network db -e SERVER_ID=10 -p 127.0.0.1:3310:3306 markuman/mariadb:alpine-10.4
+```
+
+jump into container and apply dump
+
+```sql
+mysql < writer_dump.sql
+mysql
+
+CHANGE MASTER TO
+MASTER_HOST='mariadb',
+MASTER_USER='repl',
+MASTER_PASSWORD='repl',
+MASTER_PORT=3306,
+MASTER_LOG_FILE='77abd7ecc317-bin.000001',
+MASTER_LOG_POS=39867,
+MASTER_CONNECT_RETRY=10;
+
+start slave;
+```
+
+and you're done.
+
+check with `SHOW SLAVE STATUS \G`
+
+# proxysql
+
+create `monitor` user for proxysql
+
+```sql
+CREATE USER 'monitor'@'%' IDENTIFIED BY 'monitor';
+GRANT SELECT on sys.* to 'monitor'@'%';
+```

docker/mariadb/10.4/start.sh

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+#!/bin/sh
+
+N=$(ls -l /var/lib/mysql|head -n 1|awk '{print $2}')
+
+if [ $N -eq 0 ]
+then
+	echo "init mariadb"
+	mysql_install_db --user=mysql --datadir=/var/lib/mysql
+fi
+
+sed -i 's,skip-networking,#skip-networking,' /etc/my.cnf.d/mariadb-server.cnf
+sed -i 's,#bind-address,bind-address,' /etc/my.cnf.d/mariadb-server.cnf
+
+if [ -z ${SERVER_ID+x} ]; then
+    SID=1
+else
+    SID="$SERVER_ID"
+fi
+
+if [ -z ${QUERY_CACHE+x} ]; then
+    QCACHE=OFF
+else
+    QCACHE="$QUERY_CACHE"
+fi
+
+if [ -z ${INNODB_BUFFER_POOL} ]; then
+    IBP=256M
+else
+    IBP="$INNODB_BUFFER_POOL"
+fi
+
+if [ -z ${MAX_ALLOW_PACKET} ]; then
+    MAP=16M
+else
+    MAP="$MAX_ALLOW_PACKET"
+fi
+
+if [ -z ${MAX_CONNECTIONS} ]; then
+    MC=100
+else
+    MC="$MAX_CONNECTIONS"
+fi
+
+echo "given server id $SERVER_ID"
+echo "using server id $SID"
+echo "query cache is $QCACHE"
+
+echo "start mariadb"
+
+if [ -z ${SLOW_LOG+x} ]; then
+    mysqld_safe --gtid-domain-id "$SID" \
+        --server-id "$SID" \
+        --innodb-buffer-pool-size="$IBP" \
+        --log-bin \
+        --query_cache_size 10M \
+        --query_cache_type "$QCACHE" \
+        --max-allowed-packet="$MAP" \
+        --max-connections="$MC" ${READ_ONLY}
+else
+    mysqld_safe --gtid-domain-id "$SID" \
+        --server-id "$SID" \
+        --log-bin \
+        --query_cache_size 10M \
+        --query_cache_type "$QCACHE" \
+        --max-allowed-packet="$MAP" \
+        --max-connections="$MC" \
+        --slow-query-log \
+        --slow-query-log-file=/var/lib/mysql/slow_query.log ${READ_ONLY}
+fi