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Support for basic Master-Slave Replication on 5.6 #43

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Support for basic Master-Slave Replication on 5.6 #43

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a376057
support for Master-Slave Replication
ioggstream Jan 21, 2015
3b12e30
fix: configurable MYSQL_MASTER_WAIT_TIME
ioggstream Jan 22, 2015
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64 changes: 64 additions & 0 deletions 5.6/docker-entrypoint.sh
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Original file line number Diff line number Diff line change
@@ -1,4 +1,13 @@
#!/bin/bash
#
# Supported environment variables for this entrypoint:
# - MYSQL_ROOT_PASSWORD
# - MYSQL_REPLICA_USER: create the given user on the intended master host
# - MYSQL_REPLICA_PASS
# - MYSQL_MASTER_SERVER: change master on this location on the intended slave
# - MYSQL_MASTER_PORT: optional, by default 3306
# - MYSQL_MASTER_WAIT_TIME: seconds to wait for the master to come up
#
set -e

# TODO read this from the MySQL config?
Expand Down Expand Up @@ -42,6 +51,61 @@ if [ ! -d "$DATADIR/mysql" -a "${1%_safe}" = 'mysqld' ]; then
echo "GRANT ALL ON \`$MYSQL_DATABASE\`.* TO '$MYSQL_USER'@'%' ;" >> "$tempSqlFile"
fi
fi

#
# A replication user (actually created on both master and slaves)
#
if [ "$MYSQL_REPLICA_USER" ]; then
if [ -z "$MYSQL_REPLICA_PASS" ]; then
echo >&2 'error: MYSQL_REPLICA_USER set, but MYSQL_REPLICA_PASS not set'
exit 1
fi
echo "CREATE USER '$MYSQL_REPLICA_USER'@'%' IDENTIFIED BY '$MYSQL_REPLICA_PASS'; " >> "$tempSqlFile"
echo "GRANT REPLICATION SLAVE ON *.* TO '$MYSQL_REPLICA_USER'@'%'; " >> "$tempSqlFile"
# REPLICATION CLIENT privileges are required to get master position
echo "GRANT REPLICATION CLIENT ON *.* TO '$MYSQL_REPLICA_USER'@'%'; " >> "$tempSqlFile"
fi

#
# On the slave: point to a master server
#
if [ "$MYSQL_MASTER_SERVER" ]; then
MYSQL_MASTER_PORT=${MYSQL_MASTER_PORT:-3306}
MYSQL_MASTER_WAIT_TIME=${MYSQL_MASTER_WAIT_TIME:-3}

if [ -z "$MYSQL_REPLICA_USER" ]; then
echo >&2 'error: MYSQL_REPLICA_USER not set'
exit 1
fi
if [ -z "$MYSQL_REPLICA_PASS" ]; then
echo >&2 'error: MYSQL_REPLICA_PASS not set'
exit 1
fi

# Wait for eg. 10 seconds for the master to come up
# do at least one iteration
for i in $(seq $((MYSQL_MASTER_WAIT_TIME + 1))); do
if ! mysql "-u$MYSQL_REPLICA_USER" "-p$MYSQL_REPLICA_PASS" "-h$MYSQL_MASTER_SERVER" -e 'select 1;' |grep -q 1; then
echo >&2 "Waiting for $MYSQL_REPLICA_USER@$MYSQL_MASTER_SERVER"
sleep 1
else
break
fi
done

if [ "$i" -gt "$MYSQL_MASTER_WAIT_TIME" ]; then
echo 2>&1 "Master is not reachable"
exit 1
fi

# Get master position and set it on the slave. NB: MASTER_PORT and MASTER_LOG_POS must not be quoted
MasterPosition=$(mysql "-u$MYSQL_REPLICA_USER" "-p$MYSQL_REPLICA_PASS" "-h$MYSQL_MASTER_SERVER" -e "show master status \G" | awk '/Position/ {print $2}')
MasterFile=$(mysql "-u$MYSQL_REPLICA_USER" "-p$MYSQL_REPLICA_PASS" "-h$MYSQL_MASTER_SERVER" -e "show master status \G" | awk '/File/ {print $2}')
echo "CHANGE MASTER TO MASTER_HOST='$MYSQL_MASTER_SERVER', MASTER_PORT=$MYSQL_MASTER_PORT, MASTER_USER='$MYSQL_REPLICA_USER', MASTER_PASSWORD='$MYSQL_REPLICA_PASS', MASTER_LOG_FILE='$MasterFile', MASTER_LOG_POS=$MasterPosition;" >> "$tempSqlFile"

echo "START SLAVE;" >> "$tempSqlFile"
fi


echo 'FLUSH PRIVILEGES ;' >> "$tempSqlFile"

Expand Down