1 files changed, 48 insertions, 0 deletions
diff --git a/mysql/root-galera/usr/share/container-scripts/mysql/galera/configure-galera.sh b/mysql/root-galera/usr/share/container-scripts/mysql/galera/configure-galera.sh
new file mode 100755
index 0000000..05829a4
--- /dev/null
+++ b/mysql/root-galera/usr/share/container-scripts/mysql/galera/configure-galera.sh
@@ -0,0 +1,48 @@
+#! /bin/bash
+
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script writes out a mysql galera config using a list of newline seperated
+# peer DNS names it accepts through stdin.
+
+# /etc/mysql is assumed to be a shared volume so we can modify my.cnf as required
+# to keep the config up to date, without wrapping mysqld in a custom pid1.
+# The config location is intentionally not /etc/mysql/my.cnf because the
+# standard base image clobbers that location.
+CFG=/etc/my.cnf.d/cluster.cnf
+
+function join {
+    local IFS="$1"; shift; echo "$*";
+}
+
+HOSTNAME=$(hostname)
+while read -ra LINE; do
+    if [[ "${LINE}" == *"${HOSTNAME}"* ]]; then
+        MY_NAME=$LINE
+    fi
+    PEERS=("${PEERS[@]}" $LINE)
+done
+
+if [ "${#PEERS[@]}" = 1 ]; then
+    WSREP_CLUSTER_ADDRESS=""
+else
+    WSREP_CLUSTER_ADDRESS=$(join , "${PEERS[@]}")
+fi
+
+sed -i -e "s|^wsrep_node_address=.*$|wsrep_node_address=${MY_NAME}|" ${CFG}
+sed -i -e "s|^wsrep_cluster_address=.*$|wsrep_cluster_address=gcomm://${WSREP_CLUSTER_ADDRESS}|" ${CFG}
+
+# don't need a restart, we're just writing the conf in case there's an
+# unexpected restart on the node.