Merge "Improve fault tolerance of MariaDB startup"
This commit is contained in:
Zuul
Gerrit Code Review
commit
28a649bbbe
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@ -19,7 +19,128 @@ set -xe
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# Bootstrap database
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CLUSTER_INIT_ARGS=""
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if [ ! -d /var/lib/mysql/mysql ]; then
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CLUSTER_CONFIG_PATH=/etc/mysql/conf.d/10-cluster-config.cnf
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function exitWithManualRecovery() {
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UUID=$(sed -e 's/^.*uuid:[\ ,\t]*//' -e 'tx' -e 'd' -e ':x' /var/lib/mysql/grastate.dat)
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SEQNO=$(sed -e 's/^.*seqno:[\ ,\t]*//' -e 'tx' -e 'd' -e ':x' /var/lib/mysql/grastate.dat)
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cat >/dev/stderr <<EOF
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**********************************************************
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* MANUAL RECOVERY ACTION REQUIRED *
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**********************************************************
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All cluster members are down and grastate.dat indicates that it's not
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safe to start the cluster from this node. If you see this message on
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all nodes, you have to do a manual recovery by following these steps:
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a) Find the node with the highest WSREP seq#:
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POD ${PODNAME} uuid: ${UUID} seq: ${SEQNO}
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If you see uuid 00000000-0000-0000-0000-000000000000 with
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seq -1, the node crashed during DDL.
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If seq is -1 you will find a DETECTED CRASH message
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on your log. Check the output from InnoDB for the last
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transaction id available.
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b) Set environment variable FORCE_RECOVERY=<NAME OF POD>
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to force bootstrapping from the specified node.
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Remember to remove FORCE_RECOVERY after your nodes
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are fully recovered! You may lose data otherwise.
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You can ignore this message and wait for the next restart if at
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least one node started without errors.
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EOF
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exit 1
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}
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# Construct cluster config
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MEMBERS=""
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for i in $(seq 1 ${MARIADB_REPLICAS}); do
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if [ "$i" -eq "1" ]; then
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NUM="0"
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else
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NUM="$(expr $i - 1)"
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fi
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CANDIDATE_POD="${SERVICE_NAME}-$NUM.$(hostname -d)"
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if [ "x${CANDIDATE_POD}" != "x${POD_NAME}.$(hostname -d)" ]; then
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if [ -n "${MEMBERS}" ]; then
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MEMBERS+=,
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fi
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MEMBERS+="${CANDIDATE_POD}:${WSREP_PORT}"
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fi
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done
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echo "Writing cluster config for ${POD_NAME} to ${CLUSTER_CONFIG_PATH}"
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cat > ${CLUSTER_CONFIG_PATH} <<EOF
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[mysqld]
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wsrep_cluster_address="gcomm://${MEMBERS}"
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wsrep_node_address=${POD_IP}
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wsrep_node_name=${POD_NAME}.$(hostname -d)
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EOF
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if [ ! -z "${FORCE_RECOVERY// }" ]; then
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cat >/dev/stderr <<EOF
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**********************************************************
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* !!! FORCE_RECOVERY WARNING !!! *
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**********************************************************
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POD is starting with FORCE_RECOVERY defined. Remember to unset this
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variable after recovery! You may end up in recovering from a node
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with old data on a crash!
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You have been warned ;-)
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**********************************************************
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* FORCE_RECOVERY WARNING *
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**********************************************************
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EOF
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fi
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if [ -d /var/lib/mysql/mysql -a -f /var/lib/mysql/grastate.dat ]; then
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# Node already initialized
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if [ "$(sed -e 's/^.*seqno:[\ ,\t]*//' -e 'tx' -e 'd' -e ':x' /var/lib/mysql/grastate.dat)" = "-1" ]; then
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cat >/dev/stderr <<EOF
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**********************************************************
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* DETECTED CRASH *
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**********************************************************
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Trying to recover from a previous crash by running with wsrep-recover...
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EOF
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mysqld --wsrep_cluster_address=gcomm:// --wsrep-recover
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fi
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echo "Check if we can find a cluster memeber."
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if ! mysql --defaults-file=/etc/mysql/admin_user.cnf \
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--connect-timeout 2 \
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-e 'select 1'; then
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# No other nodes are running
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if [ -z "${FORCE_RECOVERY// }" -a "$(sed -e 's/^.*safe_to_bootstrap:[\ ,\t]*//' -e 'tx' -e 'd' -e ':x' /var/lib/mysql/grastate.dat)" = "1" ]; then
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echo 'Bootstrapping from this node.'
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CLUSTER_INIT_ARGS=--wsrep-new-cluster
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elif [ "x${FORCE_RECOVERY}x" = "x${POD_NAME}x" ]; then
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echo 'Forced recovery bootstrap from this node.'
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CLUSTER_INIT_ARGS=--wsrep-new-cluster
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cp -f /var/lib/mysql/grastate.dat /var/lib/mysql/grastate.bak
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cat >/var/lib/mysql/grastate.dat <<EOF
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`grep -v 'safe_to_bootstrap:' /var/lib/mysql/grastate.bak`
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safe_to_bootstrap: 1
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EOF
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chown -R mysql:mysql /var/lib/mysql/grastate.dat
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else
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exitWithManualRecovery
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fi
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fi
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elif [ ! -d /var/lib/mysql/mysql -o "x${FORCE_BOOTSTRAP}" = "xtrue" ]; then
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if [ "x${POD_NAME}" = "x${SERVICE_NAME}-0" ]; then
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echo No data found for pod 0
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if [ "x${FORCE_BOOTSTRAP}" = "xtrue" ]; then
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@ -43,32 +164,6 @@ if [ ! -d /var/lib/mysql/mysql ]; then
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chown -R mysql:mysql /var/lib/mysql
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fi
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# Construct cluster config
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CLUSTER_CONFIG_PATH=/etc/mysql/conf.d/10-cluster-config.cnf
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MEMBERS=""
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for i in $(seq 1 ${MARIADB_REPLICAS}); do
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if [ "$i" -eq "1" ]; then
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NUM="0"
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else
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NUM="$(expr $i - 1)"
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fi
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CANDIDATE_POD="${SERVICE_NAME}-$NUM.$(hostname -d)"
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if [ "x${CANDIDATE_POD}" != "x${POD_NAME}.$(hostname -d)" ]; then
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if [ -n "${MEMBERS}" ]; then
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MEMBERS+=,
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fi
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MEMBERS+="${CANDIDATE_POD}:${WSREP_PORT}"
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fi
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done
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echo "Writing cluster config for ${POD_NAME} to ${CLUSTER_CONFIG_PATH}"
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cat >> ${CLUSTER_CONFIG_PATH} << EOF
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[mysqld]
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wsrep_cluster_address="gcomm://${MEMBERS}"
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wsrep_node_address=${POD_IP}
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wsrep_node_name=${POD_NAME}.$(hostname -d)
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EOF
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if [ "x${CLUSTER_BOOTSTRAP}" = "xtrue" ]; then
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mysql_install_db --user=mysql --datadir=/var/lib/mysql
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@ -27,6 +27,7 @@ metadata:
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name: mariadb
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spec:
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serviceName: "{{ tuple "oslo_db" "discovery" . | include "helm-toolkit.endpoints.hostname_short_endpoint_lookup" }}"
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podManagementPolicy: "Parallel"
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replicas: {{ .Values.pod.replicas.server }}
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template:
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metadata:
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@ -74,6 +75,8 @@ spec:
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fieldPath: metadata.name
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- name: FORCE_BOOTSTRAP
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value: {{ .Values.force_bootstrap | quote }}
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- name: FORCE_RECOVERY
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value: {{ .Values.force_recovey | quote }}
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- name: BOOTSTRAP_FILE
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value: {{ printf "/tmp/%s.sql" (randAlphaNum 8) }}
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- name: MARIADB_REPLICAS
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