From c16c78bf8a98618ad2cbb9dfe115b3fa002bbe3e Mon Sep 17 00:00:00 2001 From: Celestino Rey Date: Thu, 15 Jul 2021 16:21:03 +0200 Subject: [PATCH] =?UTF-8?q?A=C3=B1ado=20un=20ejemplo=20de=20Statefulset=20?= =?UTF-8?q?con=20mysql?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- StatefulSet/mysql-configmap.yaml | 17 +++ StatefulSet/mysql-services.yaml | 31 ++++++ StatefulSet/mysql-statefulset.yaml | 167 +++++++++++++++++++++++++++++ StatefulSet/pv-mysql-01.yaml | 12 +++ StatefulSet/pv-mysql-02.yaml | 12 +++ StatefulSet/pv-mysql-03.yaml | 12 +++ 6 files changed, 251 insertions(+) create mode 100644 StatefulSet/mysql-configmap.yaml create mode 100644 StatefulSet/mysql-services.yaml create mode 100644 StatefulSet/mysql-statefulset.yaml create mode 100644 StatefulSet/pv-mysql-01.yaml create mode 100644 StatefulSet/pv-mysql-02.yaml create mode 100644 StatefulSet/pv-mysql-03.yaml diff --git a/StatefulSet/mysql-configmap.yaml b/StatefulSet/mysql-configmap.yaml new file mode 100644 index 00000000..43769248 --- /dev/null +++ b/StatefulSet/mysql-configmap.yaml @@ -0,0 +1,17 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + name: mysql + labels: + app: mysql +data: + primary.cnf: | + # Apply this config only on the primary. + [mysqld] + log-bin + replica.cnf: | + # Apply this config only on replicas. + [mysqld] + super-read-only + + diff --git a/StatefulSet/mysql-services.yaml b/StatefulSet/mysql-services.yaml new file mode 100644 index 00000000..8e72897c --- /dev/null +++ b/StatefulSet/mysql-services.yaml @@ -0,0 +1,31 @@ +# Headless service for stable DNS entries of StatefulSet members. +apiVersion: v1 +kind: Service +metadata: + name: mysql + labels: + app: mysql +spec: + ports: + - name: mysql + port: 3306 + clusterIP: None + selector: + app: mysql +--- +# Client service for connecting to any MySQL instance for reads. +# For writes, you must instead connect to the primary: mysql-0.mysql. +apiVersion: v1 +kind: Service +metadata: + name: mysql-read + labels: + app: mysql +spec: + ports: + - name: mysql + port: 3306 + selector: + app: mysql + + diff --git a/StatefulSet/mysql-statefulset.yaml b/StatefulSet/mysql-statefulset.yaml new file mode 100644 index 00000000..79ac7ade --- /dev/null +++ b/StatefulSet/mysql-statefulset.yaml @@ -0,0 +1,167 @@ +apiVersion: apps/v1 +kind: StatefulSet +metadata: + name: mysql +spec: + selector: + matchLabels: + app: mysql + serviceName: mysql + replicas: 3 + template: + metadata: + labels: + app: mysql + spec: + initContainers: + - name: init-mysql + image: mysql:5.7 + command: + - bash + - "-c" + - | + set -ex + # Generate mysql server-id from pod ordinal index. + [[ `hostname` =~ -([0-9]+)$ ]] || exit 1 + ordinal=${BASH_REMATCH[1]} + echo [mysqld] > /mnt/conf.d/server-id.cnf + # Add an offset to avoid reserved server-id=0 value. + echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf + # Copy appropriate conf.d files from config-map to emptyDir. + if [[ $ordinal -eq 0 ]]; then + cp /mnt/config-map/primary.cnf /mnt/conf.d/ + else + cp /mnt/config-map/replica.cnf /mnt/conf.d/ + fi + volumeMounts: + - name: conf + mountPath: /mnt/conf.d + - name: config-map + mountPath: /mnt/config-map + - name: clone-mysql + image: gcr.io/google-samples/xtrabackup:1.0 + command: + - bash + - "-c" + - | + set -ex + # Skip the clone if data already exists. + [[ -d /var/lib/mysql/mysql ]] && exit 0 + # Skip the clone on primary (ordinal index 0). + [[ `hostname` =~ -([0-9]+)$ ]] || exit 1 + ordinal=${BASH_REMATCH[1]} + [[ $ordinal -eq 0 ]] && exit 0 + # Clone data from previous peer. + ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql + # Prepare the backup. + xtrabackup --prepare --target-dir=/var/lib/mysql + volumeMounts: + - name: data + mountPath: /var/lib/mysql + subPath: mysql + - name: conf + mountPath: /etc/mysql/conf.d + containers: + - name: mysql + image: mysql:5.7 + env: + - name: MYSQL_ALLOW_EMPTY_PASSWORD + value: "1" + ports: + - name: mysql + containerPort: 3306 + volumeMounts: + - name: data + mountPath: /var/lib/mysql + subPath: mysql + - name: conf + mountPath: /etc/mysql/conf.d + resources: + requests: + cpu: 500m + memory: 1Gi + livenessProbe: + exec: + command: ["mysqladmin", "ping"] + initialDelaySeconds: 30 + periodSeconds: 10 + timeoutSeconds: 5 + readinessProbe: + exec: + # Check we can execute queries over TCP (skip-networking is off). + command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"] + initialDelaySeconds: 5 + periodSeconds: 2 + timeoutSeconds: 1 + - name: xtrabackup + image: gcr.io/google-samples/xtrabackup:1.0 + ports: + - name: xtrabackup + containerPort: 3307 + command: + - bash + - "-c" + - | + set -ex + cd /var/lib/mysql + + # Determine binlog position of cloned data, if any. + if [[ -f xtrabackup_slave_info && "x$( change_master_to.sql.in + # Ignore xtrabackup_binlog_info in this case (it's useless). + rm -f xtrabackup_slave_info xtrabackup_binlog_info + elif [[ -f xtrabackup_binlog_info ]]; then + # We're cloning directly from primary. Parse binlog position. + [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1 + rm -f xtrabackup_binlog_info xtrabackup_slave_info + echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\ + MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in + fi + + # Check if we need to complete a clone by starting replication. + if [[ -f change_master_to.sql.in ]]; then + echo "Waiting for mysqld to be ready (accepting connections)" + until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done + + echo "Initializing replication from clone position" + mysql -h 127.0.0.1 \ + -e "$(