POSTGRES_XLOG_DIR to specify transaction log dir

Adds support for the POSTGRES_XLOG_DIR environment variable, which specifies where the postgres transaction log is stored.

For some use cases, being able to place the transaction log on a different volume is useful.

Existing support for providing flags via $POSTGRES_INITDB_ARGS is inadequate because of the need to create and chown/chmod the directory prior to running initdb.

Author: DanielDent

9.2/alpine/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.2/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.3/alpine/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.3/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.4/alpine/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.4/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.5/alpine/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.5/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.6/alpine/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

9.6/docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql

docker-entrypoint.sh

@@ -10,6 +10,14 @@ if [ "$1" = 'postgres' ]; then
 	chmod 700 "$PGDATA"
 	chown -R postgres "$PGDATA"
 
+    # Create the transaction log directory before initdb is run (below) so the directory is owend by the correct user
+    if [ "$POSTGRES_XLOG_DIR" ]; then
+        mkdir -p "$POSTGRES_XLOG_DIR"
+        chmod 700 "$POSTGRES_XLOG_DIR"
+        chown -R postgres "$POSTGRES_XLOG_DIR"
+        POSTGRES_INITDB_ARGS="$POSTGRES_INITDB_ARGS --xlogdir $POSTGRES_XLOG_DIR"
+    fi
+
 	mkdir -p /run/postgresql
 	chmod g+s /run/postgresql
 	chown -R postgres /run/postgresql