MySQL集群：关于k8s环境部署mysql主从的问题

2、mysql-service.yaml

# Headless service for stable DNS entries of StatefulSet members.
apiVersion: v1
kind: Service
metadata:
name: mysql
namespace: 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 master: mysql-0.mysql.
apiVersion: v1
kind: Service
metadata:
name: mysql-read
namespace: mysql
labels:
app: mysql
spec:
ports:
name: mysql
port: 3306
selector:
app: mysql

3、mysql-statefulset.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
name: mysql
namespace: mysql
spec:
selector:
matchLabels:
app: mysql
serviceName: mysql
replicas: 3
template:
metadata:
labels:
app: mysql
spec:
tolerations:
effect: NoSchedule
operator: Exists
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms: # 调度指定标签节点
matchExpressions:
key: node-role.kubernetes.io/compute
operator: In
values:
dedicated-middleware
initContainers:
name: init-mysql
image: mysql:5.7.35
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 [[ $ordinal -eq 0 ]]; then
cp /mnt/config-map/master.cnf /mnt/conf.d/
else
cp /mnt/config-map/slave.cnf /mnt/conf.d/
fi
volumeMounts:
name: conf
mountPath: /mnt/conf.d
name: config-map
mountPath: /mnt/config-map
name: clone-mysql
image: registry.cn-shanghai.aliyuncs.com/soulchild/xtrabackup:2.4
command:
bash
-c
|
set -ex
# Skip the clone if data already exists.
[[ -d /var/lib/mysql/mysql ]] exit 0
# Skip the clone on master (ordinal index 0).
[[ `hostname` =~ -([0-9]+)$ ]] || 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:5.7.35
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: registry.cn-shanghai.aliyuncs.com/soulchild/xtrabackup:2.4
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$( xtrabackup_slave_info) != x ]]; then
# XtraBackup already generated a partial CHANGE MASTER TO query
# because we re cloning from an existing slave. (Need to remove the tailing semicolon!)
cat xtrabackup_slave_info | sed -E s/;$//g 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 master. 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 $( change_master_to.sql.in), \
MASTER_HOST= mysql-0.mysql , \
MASTER_USER= root , \
MASTER_PASSWORD= , \
MASTER_CONNECT_RETRY=10; \
START SLAVE; || exit 1
# In case of container restart, attempt this at-most-once.
mv change_master_to.sql.in change_master_to.sql.orig
fi

# Start a server to send backups when requested by peers.
exec ncat listen keep-open send-only max-conns=1 3307 -c \
xtrabackup backup slave-info stream=xbstream host=127.0.0.1 user=root
volumeMounts:
name: data
mountPath: /var/lib/mysql
subPath: mysql
name: conf
mountPath: /etc/mysql/conf.d
resources:
requests:
cpu: 100m
memory: 100Mi
volumes:
name: conf
emptyDir: {}
name: config-map
configMap:
name: mysql
volumeClaimTemplates:
metadata:
name: data
spec:
accessModes:
ReadWriteOnce
resources:
requests:
storage: 30Gi

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数据库远程运维 MySQL集群：关于k8s环境部署mysql主从的问题