我在kubernetes v1.16.0集群中使用舵机安装MySQL HA。
./helm install report incubator/mysqlha -n middleware
现在，我ping的状态集服务，但给我的提示。
/ # ping report-mysqlha.middleware.svc.cluster.local
PING report-mysqlha.middleware.svc.cluster.local (10.244.2.57): 56 data bytes
64 bytes from 10.244.2.57: seq=0 ttl=62 time=0.223 ms
64 bytes from 10.244.2.57: seq=1 ttl=62 time=0.173 ms
64 bytes from 10.244.2.57: seq=2 ttl=62 time=0.190 ms
^C
--- report-mysqlha.middleware.svc.cluster.local ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.173/0.195/0.223 ms
/ # ping report-mysqlha-0.middleware.svc.cluster.local
ping: bad address 'report-mysqlha-0.middleware.svc.cluster.local'
这是我的状态集定义。
kind: StatefulSet
apiVersion: apps/v1
metadata:
name: report-mysqlha
namespace: middleware
selfLink: /apis/apps/v1/namespaces/middleware/statefulsets/report-mysqlha
uid: d0a67983-3198-48e9-bad8-b06f3312945b
resourceVersion: '311068'
generation: 1
creationTimestamp: '2020-06-07T08:27:37Z'
labels:
app: report-mysqlha
app.kubernetes.io/managed-by: Helm
chart: mysqlha-2.0.0
heritage: Helm
release: report
annotations:
meta.helm.sh/release-name: report
meta.helm.sh/release-namespace: middleware
spec:
replicas: 3
selector:
matchLabels:
app: report-mysqlha
template:
metadata:
creationTimestamp: null
labels:
app: report-mysqlha
release: report
spec:
volumes:
- name: conf
emptyDir: {}
- name: config-map
configMap:
name: report-mysqlha
defaultMode: 420
- name: scripts
emptyDir: {}
initContainers:
- name: clone-mysql
image: 'gcr.io/google-samples/xtrabackup:1.0'
command:
- bash
- '-c'
- >
set -ex
# Skip the clone on master (ordinal index 0).
[[ `hostname` =~ -([0-9]+)$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
[[ $ordinal -eq 0 ]] && exit 0
# If data already exists, delete and proceed to clone.
[[ -d /var/lib/mysql/mysql ]] && rm -fr /var/lib/mysql/*
# Clone data from previous peer.
ncat --recv-only report-mysqlha-$(($ordinal-1)).report-mysqlha
3307 | xbstream -x -C /var/lib/mysql
# Prepare the backup.
xtrabackup --prepare --user=${MYSQL_REPLICATION_USER}
--password=${MYSQL_REPLICATION_PASSWORD}
--target-dir=/var/lib/mysql
env:
- name: MYSQL_REPLICATION_USER
value: repl
- name: MYSQL_REPLICATION_PASSWORD
valueFrom:
secretKeyRef:
name: report-mysqlha
key: mysql-replication-password
resources: {}
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
imagePullPolicy: IfNotPresent
- name: init-mysql
image: 'mysql:5.7.29'
command:
- /bin/bash
args:
- '-c'
- >
set -ex
# Generate mysql server-id from pod ordinal index.
[[ `hostname` =~ -([0-9]+)$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
# Copy server-id.conf adding offset to avoid reserved server-id=0
value.
cat /mnt/config-map/server-id.cnf | sed s/@@SERVER_ID@@/$((100 +
$ordinal))/g > /mnt/conf.d/server-id.cnf
# Copy appropriate conf.d files from config-map to config mount.
if [[ $ordinal -eq 0 ]]; then
cp -f /mnt/config-map/master.cnf /mnt/conf.d/
else
cp -f /mnt/config-map/slave.cnf /mnt/conf.d/
fi
# Copy replication user script
if [[ $ordinal -eq 0 ]]; then
cp -f /mnt/config-map/create-replication-user.sh /mnt/scripts/create-replication-user.sh
chmod 700 /mnt/scripts/create-replication-user.sh
fi
resources: {}
volumeMounts:
- name: conf
mountPath: /mnt/conf.d
- name: config-map
mountPath: /mnt/config-map
- name: scripts
mountPath: /mnt/scripts
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
imagePullPolicy: IfNotPresent
containers:
- name: mysql
image: 'mysql:5.7.29'
ports:
- name: mysql
containerPort: 3306
protocol: TCP
env:
- name: MYSQL_DATABASE
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: report-mysqlha
key: mysql-root-password
- name: MYSQL_REPLICATION_USER
value: repl
- name: MYSQL_REPLICATION_PASSWORD
valueFrom:
secretKeyRef:
name: report-mysqlha
key: mysql-replication-password
resources:
requests:
cpu: 100m
memory: 128Mi
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
livenessProbe:
exec:
command:
- /bin/sh
- '-c'
- 'mysqladmin ping -h 127.0.0.1 -u root -p${MYSQL_ROOT_PASSWORD}'
initialDelaySeconds: 30
timeoutSeconds: 5
periodSeconds: 10
successThreshold: 1
failureThreshold: 3
readinessProbe:
exec:
command:
- /bin/sh
- '-c'
- 'MYSQL_PWD="${MYSQL_ROOT_PASSWORD}"'
- mysql -h 127.0.0.1 -u root -e "SELECT 1"
initialDelaySeconds: 10
timeoutSeconds: 1
periodSeconds: 10
successThreshold: 1
failureThreshold: 3
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
imagePullPolicy: IfNotPresent
- name: xtrabackup
image: 'gcr.io/google-samples/xtrabackup:1.0'
command:
- /bin/bash
args:
- '-c'
- |
set -ex
echo "Waiting for mysqld to be ready (accepting connections)"
until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 5; done
# Create replication user
cd /mnt/scripts
# file exists and is not empty with -s
if [[ -s create-replication-user.sh ]]; then
ls -la
./create-replication-user.sh
fi
cd /var/lib/mysql
# Determine binlog position of cloned data, if any.
if [[ -f xtrabackup_slave_info ]]; then
# XtraBackup already generated a partial "CHANGE MASTER TO" query
# because we're cloning from an existing slave.
cp xtrabackup_slave_info change_master_to.sql.in
elif [[ -f xtrabackup_binlog_info ]]; then
# We're cloning directly from master. Parse binlog position.
[[ $(cat xtrabackup_binlog_info) =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
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
# In case of container restart, attempt this at-most-once.
cp change_master_to.sql.in change_master_to.sql.orig
mysql -h 127.0.0.1 --verbose<<EOF
STOP SLAVE IO_THREAD;
$(<change_master_to.sql.orig),
MASTER_HOST='report-mysqlha-0.report-mysqlha',
MASTER_USER='${MYSQL_REPLICATION_USER}',
MASTER_PASSWORD='${MYSQL_REPLICATION_PASSWORD}',
MASTER_CONNECT_RETRY=10;
START SLAVE;
EOF
fi
# Start a server to send backups when requested by peers.
exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \
"xtrabackup --backup --slave-info --stream=xbstream --host=127.0.0.1 --user=${MYSQL_REPLICATION_USER} --password=${MYSQL_REPLICATION_PASSWORD}"
ports:
- name: xtrabackup
containerPort: 3307
protocol: TCP
env:
- name: MYSQL_PWD
valueFrom:
secretKeyRef:
name: report-mysqlha
key: mysql-root-password
- name: MYSQL_REPLICATION_USER
value: repl
- name: MYSQL_REPLICATION_PASSWORD
valueFrom:
secretKeyRef:
name: report-mysqlha
key: mysql-replication-password
resources:
requests:
cpu: 100m
memory: 100Mi
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
- name: scripts
mountPath: /mnt/scripts
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
imagePullPolicy: IfNotPresent
restartPolicy: Always
terminationGracePeriodSeconds: 30
dnsPolicy: ClusterFirst
securityContext: {}
schedulerName: default-scheduler
volumeClaimTemplates:
- metadata:
name: data
creationTimestamp: null
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 10Gi
volumeMode: Filesystem
status:
phase: Pending
serviceName: report-mysqlha
podManagementPolicy: OrderedReady
updateStrategy:
type: RollingUpdate
rollingUpdate:
partition: 0
revisionHistoryLimit: 10
status:
observedGeneration: 1
replicas: 3
readyReplicas: 3
currentReplicas: 3
updatedReplicas: 3
currentRevision: report-mysqlha-f7648c684
updateRevision: report-mysqlha-f7648c684
collisionCount: 0
我是否遗漏了什么？
随着Statefulset的每个Pod被创建，它得到一个匹配的DNS子域，采取的形式。$(podname).$(governing service domain).
对于你的情况。
report-mysqlha-0report-mysqlha.middleware.svc.cluster.local花苞的子域将是。report-mysqlha-0.report-mysqlha.middleware.svc.cluster.local
report-mysqlha-0 是 pod 的名称，而不是服务的名称。因此，你不能通过 report-mysqlha-0.middleware.svc.cluster.local