onlineCheck (#52)

Added some usefull info and updated the deployment.yaml

docker/files/cli/commands/cluster.sh

@@ -30,6 +30,8 @@ command_init() {
 
  sleep 5
 
+ command_sync:checkOnline
+
  touch /proxysql-ready
 }
 
@@ -248,3 +250,44 @@ command_sync:cluster() {
 
  sleep 1
 }
+
+commands_add "sync:checkOnline" "Check if all available servers are online"
+command_sync:checkOnline() {
+
+ echo -e "\e[33m Check added MySQL servers \e[0m"
+
+ confTotal=$(
+ proxysql_execute_query "
+ SELECT COUNT (*) FROM mysql_servers;
+ ";
+ )
+ echo -e "\e[33m The number of servers found is" $confTotal "in total \e[0m"
+
+ sleep 5
+
+ echo -e "\e[33m Check current state of all available servers \e[0m"
+
+ proxysql_execute_query "
+ SELECT hostgroup_id,hostname,status FROM mysql_servers;
+ " | while read hostgroup_id hostname status; do
+ # use $hostgroup_id and $status variables
+ echo "Checking - hostID: $hostgroup_id, hostname: $hostname, status: $status"
+ # when working with a service "status" as indicator isn't always right
+ if mysqladmin ping -u${MYSQL_ADMIN_USERNAME} -p${MYSQL_ADMIN_PASSWORD} -h$hostname; then
+ echo -e "\e[33m $hostname is operating normaly \e[0m"
+ else
+ echo -e "\e[33m $hostname is not active \e[0m"
+ foundTotal=$((foundTotal + 1))
+ echo -e "\e[33m Found:" $foundTotal " offline server(s), out of " $confTotal " server(s) total \e[0m"
+ if [ $foundTotal = $confTotal ]; then
+ # All servers are Offline
+ echo -e "\e[33m All servers are offline, this container is unhealthy. \e[0m"
+ # lets exit this container using liveness probe
+ rm -rf /proxysql-liveness
+ echo -e "\e[33m Liveness state updated to destroy this container. \e[0m"
+ fi
+ fi
+ done
+
+ sleep 1
+}

docker/files/entrypoint.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -e
 
+touch /proxysql-liveness
+
 if [[ ! -z $CONFIG_TEMPLATE && -s "$CONFIG_TEMPLATE" ]]; then
  envsubst < $CONFIG_TEMPLATE > /etc/proxysql.cnf
  echo "Replaced content and variables from $CONFIG_TEMPLATE into /etc/proxysql.cnf"

k8s/proxysql.statefulset.yaml

@@ -57,6 +57,18 @@ spec:
  - cat
  - /proxysql-ready
 
+ livenessProbe:
+ failureThreshold: 1
+ initialDelaySeconds: 20
+ periodSeconds: 10
+ successThreshold: 1
+ timeoutSeconds: 2
+
+ exec:
+ command:
+ - cat
+ - /proxysql-liveness
+
  args: [ "--cluster" ]
 
  volumeMounts: