Install NFS service
## Installation sudo apt install nfs-kernel-server ## start up sudo /etc/init.d/nfs-kernel-server start ## Create a directory mkdir /data/nfs sudo chmod -R 777 /data/nfs ## Share nano /etc/exports ## Add to end of file /var/nfs *(insecure,rw,sync,no_root_squash) ## Restart sudo /etc/init.d/nfs-kernel-server restart
Install Helm
## Installation
curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
## Add and modify the ip to the server's internal network ip
helm repo add nfs-subdir-external-provisioner https://kubernetes-sigs.github.io/nfs-subdir-external-provisioner
helm install nfs-subdir-external-provisioner nfs-subdir-external-provisioner/nfs-subdir-external-provisioner \
--set nfs.server=x.x.x.x \
--set nfs.path=/data/nfs
kubectl apply -f mysql.yaml
# mysql secret key
apiVersion: v1
Kind: Secret
metadata:
name: mysql-secret
labels:
app: mysql
type: Opaque
data:
password: XXXXXXXXX # base64 encrypted password
---
# mysql configuration
apiVersion: v1
kind: ConfigMap
metadata:
name: mysql
labels:
app: mysql
data:
primary.cnf: |
#Master
[mysqld]
log-bin=mysqllog
replica.cnf: |
#Slave
[mysqld]
super-read-only
---
#StatefulSet mysql pod
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: mysql
labels:
app: mysql
spec:
selector:
matchLabels:
app: mysql
app.kubernetes.io/name: mysql
serviceName: mysql
replicas: 3 # Number of replicas, number in the cluster
template:
metadata:
labels:
app:mysql
app.kubernetes.io/name: mysql
spec:
initContainers:
- name: init-mysql
image: freelizhun/mysql:5.7
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-secret
key: password
command:
- bash
- "-c"
- |
set-ex
# Generate the ID of the MySQL server based on the Pod serial number.
[[ $HOSTNAME =~ -([0-9] + )$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
echo [mysqld] > /mnt/conf.d/server-id.cnf
# Add an offset to avoid using the reserved value of server-id=0.
echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
# Copy the appropriate conf.d file from config-map to emptyDir.
if [[ $ordinal -eq 0 ]]; then
cp /mnt/config-map/primary.cnf /mnt/conf.d/
else
cp /mnt/config-map/replica.cnf /mnt/conf.d/
fi
volumeMounts:
- name: conf
mountPath: /mnt/conf.d
- name: config-map
mountPath: /mnt/config-map
- name: clone-mysql
image: freelizhun/xtrabackup:v2
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-secret
key: password
command:
- bash
- "-c"
- |
set-ex
# If data already exists, skip cloning.
[[ -d /var/lib/mysql/mysql ]] & amp; & amp; exit 0
# Skip cloning of the master instance (serial index 0).
[[ `hostname` =~ -([0-9] + )$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
[[ $ordinal -eq 0 ]] & amp; & amp; exit 0
# Clone data from original peer.
ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql
# Prepare backup.
xtrabackup --prepare --target-dir=/var/lib/mysql
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
containers:
- name: mysql
image: freelizhun/mysql:5.7
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-secret
key: password
ports:
- name: mysql
containerPort: 3306
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
resources:
requests:
cpu: 500m
memory: 1Gi
livenessProbe:
exec:
command:
- bash
- "-c"
- |
set-ex
mysqladmin ping -uroot -p${MYSQL_ROOT_PASSWORD}
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
readinessProbe:
exec:
# Check if we can perform the query over TCP (skip-networking is off).
command:
- bash
- "-c"
- |
set-ex
mysqladmin ping -uroot -p${MYSQL_ROOT_PASSWORD}
initialDelaySeconds: 5
periodSeconds: 2
timeoutSeconds: 1
- name: xtrabackup
image: freelizhun/xtrabackup:v2
ports:
- name: xtrabackup
containerPort: 3307
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-secret
key: password
command:
- bash
- "-c"
- |
set-ex
cd /var/lib/mysql
# Determine the binlog location of cloned data (if any).
if [[ -f xtrabackup_slave_info & amp; & amp; "x$(<xtrabackup_slave_info)" != "x" ]]; then
# XtraBackup has generated part of the "CHANGE MASTER TO" query
# Because we are cloning from an existing copy. (Need to remove the semicolon at the end!)
cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in
# Ignore xtrabackup_binlog_info here (it is useless).
rm -f xtrabackup_slave_info xtrabackup_binlog_info
elif [[ -f xtrabackup_binlog_info ]]; then
# We clone directly from the master instance. Parse binlog location.
[[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]] + (.*?)$ ]] || 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 cloning 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 -uroot -p${<!-- -->MYSQL_ROOT_PASSWORD} -e "SELECT 1"; do sleep 1; done
echo "Initializing replication from clone position"
mysql -h 127.0.0.1 -uroot -p${<!-- -->MYSQL_ROOT_PASSWORD} \
-e "$(<change_master_to.sql.in), \
MASTER_HOST='mysql-0.mysql', \
MASTER_USER='root', \
MASTER_PASSWORD='${<!-- -->MYSQL_ROOT_PASSWORD}', \
MASTER_CONNECT_RETRY=10; \
START SLAVE;" || exit 1
# If the container is restarted, try at most once.
mv change_master_to.sql.in change_master_to.sql.orig
fi
# Start the server to send backups when requested by the peer.
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 --password=${<!-- -->MYSQL_ROOT_PASSWORD}"
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
volumes:
- name: conf
emptyDir: {<!-- --> }
- name: config-map
configMap:
name: mysql
volumeClaimTemplates:
- metadata:
name:data
spec:
accessModes:
- "ReadWriteOnce"
storageClassName: nfs-client
resources:
requests:
Storage: 2Gi
---
#HeadlessService
apiVersion: v1
Kind: Service
metadata:
name: mysql
labels:
app:mysql
app.kubernetes.io/name: mysql
spec:
ports:
- name: mysql
port: 3306
clusterIP: None # Headless Service Headless Service
selector:
app:mysql
---
apiVersion: v1
Kind: Service
metadata:
name: mysql-read
labels:
app:mysql
app.kubernetes.io/name: mysql
readonly: "true"
spec:
ports:
- name: mysql
port: 3306
selector:
app: mysql
---
# NodePort Service
apiVersion: v1
Kind: Service
metadata:
name: mysql-node-port
labels:
app:mysql
spec:
ports:
- nodePort: 30006
port: 3306
targetPort: 3306
protocol:TCP
name: mysql
type: NodePort
selector:
app:mysql
Refer to the official documentation: https://kubernetes.io/zh-cn/docs/tasks/run-application/run-replicated-stateful-application/