k8s实战案例之部署Zookeeper集群
zookeeper是一个开源的分布式协调服务，由知名互联网公司Yahoo创建，它是Chubby的开源实现；换句话讲，zookeeper是一个典型的分布式数据一致性解决方案，分布式应用程序可以基于它实现数据的发布/订阅、负载均衡、名称服务、分布式协调/通知、集群管理、Master选举、分布式锁和分布式队列；
1、Zookeeper简介
zookeeper是一个开源的分布式协调服务，由知名互联网公司Yahoo创建，它是Chubby的开源实现；换句话讲，zookeeper是一个典型的分布式数据一致性解决方案，分布式应用程序可以基于它实现数据的发布/订阅、负载均衡、名称服务、分布式协调/通知、集群管理、Master选举、分布式锁和分布式队列；
2、PV/PVC及zookeeper
3、构建zookeeper镜像
3.1、下载java环境基础镜像，将对应镜像修改本地harbor地址上传至harbor
3.2 基于java环境基础镜像，构建zookeeper镜像
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/zookeeper# ll
total 36900
drwxr-xr-x 4 root root 4096 Jun 4 11:03 ./
drwxr-xr-x 11 root root 4096 Aug 9 2022 ../
-rw-r--r-- 1 root root 1954 Jun 4 10:57 Dockerfile
-rw-r--r-- 1 root root 63587 Jun 22 2021 KEYS
drwxr-xr-x 2 root root 4096 Jun 4 10:11 bin/
-rwxr-xr-x 1 root root 251 Jun 4 10:58 build-command.sh*
drwxr-xr-x 2 root root 4096 Jun 4 10:11 conf/
-rwxr-xr-x 1 root root 1156 Jun 4 11:03 entrypoint.sh*
-rw-r--r-- 1 root root 91 Jun 22 2021 repositories
-rw-r--r-- 1 root root 2270 Jun 22 2021 zookeeper-3.12-Dockerfile.tar.gz
-rw-r--r-- 1 root root 37676320 Jun 22 2021 zookeeper-3.4.14.tar.gz
-rw-r--r-- 1 root root 836 Jun 22 2021 zookeeper-3.4.14.tar.gz.asc
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/zookeeper# cat Dockerfile
FROM harbor.ik8s.cc/baseimages/slim_java:8
ENV ZK_VERSION 3.4.14
ADD repositories /etc/apk/repositories
# Download Zookeeper
COPY zookeeper-3.4.14.tar.gz /tmp/zk.tgz
COPY zookeeper-3.4.14.tar.gz.asc /tmp/zk.tgz.asc
COPY KEYS /tmp/KEYS
RUN apk add --no-cache --virtual .build-deps \
ca-certificates \
gnupg \
tar \
wget && \
#
# Install dependencies
apk add --no-cache \
bash && \
#
#
# Verify the signature
export GNUPGHOME="$(mktemp -d)" && \
gpg -q --batch --import /tmp/KEYS && \
gpg -q --batch --no-auto-key-retrieve --verify /tmp/zk.tgz.asc /tmp/zk.tgz && \
#
# Set up directories
#
mkdir -p /zookeeper/data /zookeeper/wal /zookeeper/log && \
#
# Install
tar -x -C /zookeeper --strip-components=1 --no-same-owner -f /tmp/zk.tgz && \
#
# Slim down
cd /zookeeper && \
cp dist-maven/zookeeper-${ZK_VERSION}.jar . && \
rm -rf \
*.txt \
*.xml \
bin/README.txt \
bin/*.cmd \
conf/* \
contrib \
dist-maven \
docs \
lib/*.txt \
lib/cobertura \
lib/jdiff \
recipes \
src \
zookeeper-*.asc \
zookeeper-*.md5 \
zookeeper-*.sha1 && \
#
# Clean up
apk del .build-deps && \
rm -rf /tmp/* "$GNUPGHOME"
# 拷贝配置文件和脚本
COPY conf /zookeeper/conf/
COPY bin/zkReady.sh /zookeeper/bin/
COPY entrypoint.sh /
ENV PATH=/zookeeper/bin:${PATH} \
ZOO_LOG_DIR=/zookeeper/log \
ZOO_LOG4J_PROP="INFO, CONSOLE, ROLLINGFILE" \
JMXPORT=9010
# 启动zookeeper，entrypoint 脚本和cmd联合使用，entrypoint会把cmd当作参数传递给entrypoint脚本执行，即entrypoint脚本通常用来做一些环境初始化；比如这里就是用来在线生成zk集群配置
ENTRYPOINT [ "/entrypoint.sh" ]
CMD [ "zkServer.sh", "start-foreground" ]
EXPOSE 2181 2888 3888 9010
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/zookeeper# cat conf/zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/zookeeper/data
dataLogDir=/zookeeper/wal
#snapCount=100000
autopurge.purgeInterval=1
clientPort=2181
quorumListenOnAllIPs=trueroot@k8s-master01:~/k8s-data/dockerfile/web/magedu/zookeeper# cat entrypoint.sh
#!/bin/bash
# 生成zk集群配置
echo ${MYID:-1} > /zookeeper/data/myid #将$MYID的值写入MYID文件,如果变量为空就默认为1,$MYID为pod中的系统级别环境变量,该变量由部署zk清单中的环境变量指定
if [ -n "$SERVERS" ]; then #如果$SERVERS不为空则向下执行,SERVERS为pod中的系统级别环境变量,该变量同样也是在zk部署清单中指定的环境变量的
IFS=\, read -a servers <<<"$SERVERS" #IFS为bash内置变量用于分割字符并将结果形成一个数组
for i in "${!servers[@]}"; do #${!servers[@]}表示获取servers中每个元素的索引值,此索引值会用做当前ZK的ID
printf "\nserver.%i=%s:2888:3888" "$((1 + $i))" "${servers[$i]}" >> /zookeeper/conf/zoo.cfg #打印结果并输出重定向到文件/zookeeper/conf/zoo.cfg，其中%i和%s的值来分别自于后面变量"$((1 + $i))" "${servers[$i]}"
done
fi
cd /zookeeper
exec "$@" #$@变量用于引用给脚本传递的所有参数,传递的所有参数会被作为一个数组列表,exec为终止当前进程、保留当前进程id、新建一个进程执行新的任务,即CMD [ "zkServer.sh", "start-foreground" ]
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/zookeeper# cat build-command.sh
#!/bin/bash
TAG=$1
#docker build -t harbor.ik8s.cc/magedu/zookeeper:${TAG} .
#sleep 1
#docker push harbor.ik8s.cc/magedu/zookeeper:${TAG}
nerdctl build -t harbor.ik8s.cc/magedu/zookeeper:${TAG} .
nerdctl push harbor.ik8s.cc/magedu/zookeeper:${TAG}
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/zookeeper#
4、测试zookeeper镜像
4.1、验证zk镜像是否上传至harbor?
4.2、将zk镜像运行为容器？看看是否可正常运行？
root@k8s-node01:~# nerdctl run -it --rm -p 2181:2181 harbor.ik8s.cc/magedu/zookeeper:v3.4.14
WARN[0000] skipping verifying HTTPS certs for "harbor.ik8s.cc"
harbor.ik8s.cc/magedu/zookeeper:v3.4.14: resolved |++++++++++++++++++++++++++++++++++++++|
manifest-sha256:6d0b49e75ea87a67c283a182a6addd53e495ab12c1d5c5a4d981ae655934c4ae: done |++++++++++++++++++++++++++++++++++++++|
config-sha256:f8bfac50f84cc3f77a58a8d5bb5c47cf3f2a05f543ad7774306d485f09edacdf: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:88286f41530e93dffd4b964e1db22ce4939fffa4a4c665dab8591fbab03d4926: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:7faf2f47dd69ec7a0e44611703ec6c400c3ca9248b306dc8c4928fecdf81cf85: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:7141511c4dad1bb64345a3cd38e009b1bcd876bba3e92be040ab2602e9de7d1e: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:c2ac2f7a5c66a805ac53df2ac25e747244602b7cde77d854b0ff00a47ec8640f: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:3cf9e52a32f5617781d616893614fd88d791040b7a78bddc833f54a7d4362ba5: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:03aad7531339cf92a0feff169cef562fa9aa62f4eb3c1090968f36280522485c: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:11620dde2c1fc91a436998729ae0f0f0bcff774f7c32c2ef0910ff4125761c2c: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:fd529fe251b34db45de24e46ae4d8f57c5b8bbcfb1b8d8c6fb7fa9fcdca8905e: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:551a566b3c61bcc1fbdfbd8f4e67afd7b63fa0b1651c461d419619f08df6599c: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:bc2237b8828aac97e90ba3b47f00f153338890638e4cfc3742c22cb92f4fd1f9: done |++++++++++++++++++++++++++++++++++++++|
layer-sha256:0221a34207fe67c83ac7b33fb5be169754666ab4841abb0c050d2ff0022c1d1a: done |++++++++++++++++++++++++++++++++++++++|
elapsed: 7.9 s total: 101.0 (12.8 MiB/s)
ZooKeeper JMX enabled by default
ZooKeeper remote JMX Port set to 9010
ZooKeeper remote JMX authenticate set to false
ZooKeeper remote JMX ssl set to false
ZooKeeper remote JMX log4j set to true
Using config: /zookeeper/bin/../conf/zoo.cfg
2023-06-04 11:11:58,379 [myid:] - INFO [main:QuorumPeerConfig@136] - Reading configuration from: /zookeeper/bin/../conf/zoo.cfg
2023-06-04 11:11:58,384 [myid:] - INFO [main:DatadirCleanupManager@78] - autopurge.snapRetainCount set to 3
2023-06-04 11:11:58,384 [myid:] - INFO [main:DatadirCleanupManager@79] - autopurge.purgeInterval set to 1
2023-06-04 11:11:58,385 [myid:] - WARN [main:QuorumPeerMain@116] - Either no config or no quorum defined in config, running in standalone mode
2023-06-04 11:11:58,385 [myid:] - INFO [PurgeTask:DatadirCleanupManager$PurgeTask@138] - Purge task started.
2023-06-04 11:11:58,387 [myid:] - INFO [main:QuorumPeerConfig@136] - Reading configuration from: /zookeeper/bin/../conf/zoo.cfg
2023-06-04 11:11:58,387 [myid:] - INFO [main:ZooKeeperServerMain@98] - Starting server
2023-06-04 11:11:58,399 [myid:] - INFO [PurgeTask:DatadirCleanupManager$PurgeTask@144] - Purge task completed.
2023-06-04 11:11:58,402 [myid:] - INFO [main:Environment@100] - Server environment:zookeeper.version=3.4.14-4c25d480e66aadd371de8bd2fd8da255ac140bcf, built on 03/06/2019 16:18 GMT
2023-06-04 11:11:58,402 [myid:] - INFO [main:Environment@100] - Server environment:host.name=07fd37df3459
2023-06-04 11:11:58,403 [myid:] - INFO [main:Environment@100] - Server environment:java.version=1.8.0_144
2023-06-04 11:11:58,403 [myid:] - INFO [main:Environment@100] - Server environment:java.vendor=Oracle Corporation
2023-06-04 11:11:58,403 [myid:] - INFO [main:Environment@100] - Server environment:java.home=/usr/lib/jvm/java-8-oracle
2023-06-04 11:11:58,403 [myid:] - INFO [main:Environment@100] - Server environment:java.class.path=/zookeeper/bin/../zookeeper-server/target/classes:/zookeeper/bin/../build/classes:/zookeeper/bin/../zookeeper-server/target/lib/*.jar:/zookeeper/bin/../build/lib/*.jar:/zookeeper/bin/../lib/slf4j-log4j12-1.7.25.jar:/zookeeper/bin/../lib/slf4j-api-1.7.25.jar:/zookeeper/bin/../lib/netty-3.10.6.Final.jar:/zookeeper/bin/../lib/log4j-1.2.17.jar:/zookeeper/bin/../lib/jline-0.9.94.jar:/zookeeper/bin/../lib/audience-annotations-0.5.0.jar:/zookeeper/bin/../zookeeper-3.4.14.jar:/zookeeper/bin/../zookeeper-server/src/main/resources/lib/*.jar:/zookeeper/bin/../conf:
2023-06-04 11:11:58,404 [myid:] - INFO [main:Environment@100] - Server environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2023-06-04 11:11:58,404 [myid:] - INFO [main:Environment@100] - Server environment:java.io.tmpdir=/tmp
2023-06-04 11:11:58,405 [myid:] - INFO [main:Environment@100] - Server environment:java.compiler=<NA>
2023-06-04 11:11:58,405 [myid:] - INFO [main:Environment@100] - Server environment:os.name=Linux
2023-06-04 11:11:58,406 [myid:] - INFO [main:Environment@100] - Server environment:os.arch=amd64
2023-06-04 11:11:58,406 [myid:] - INFO [main:Environment@100] - Server environment:os.version=5.15.0-72-generic
2023-06-04 11:11:58,406 [myid:] - INFO [main:Environment@100] - Server environment:user.name=root
2023-06-04 11:11:58,406 [myid:] - INFO [main:Environment@100] - Server environment:user.home=/root
2023-06-04 11:11:58,407 [myid:] - INFO [main:Environment@100] - Server environment:user.dir=/zookeeper
2023-06-04 11:11:58,409 [myid:] - INFO [main:ZooKeeperServer@836] - tickTime set to 2000
2023-06-04 11:11:58,409 [myid:] - INFO [main:ZooKeeperServer@845] - minSessionTimeout set to -1
2023-06-04 11:11:58,409 [myid:] - INFO [main:ZooKeeperServer@854] - maxSessionTimeout set to -1
2023-06-04 11:11:58,417 [myid:] - INFO [main:ServerCnxnFactory@117] - Using org.apache.zookeeper.server.NIOServerCnxnFactory as server connection factory
2023-06-04 11:11:58,422 [myid:] - INFO [main:NIOServerCnxnFactory@89] - binding to port 0.0.0.0/0.0.0.0:2181
能够正常运行起来并监听2181端口，说明zk镜像构建没有问题；通过上述测试，我们没有指定环境变量，对应镜像就直接以单机的方式运行；
5、在K8s环境中运行zookeeper集群
5.1、在nfs上准备pv目录
root@harbor:~# mkdir -pv /data/k8sdata/magedu/zookeeper-datadir-{1,2,3}
mkdir: created directory '/data/k8sdata/magedu/zookeeper-datadir-1'
mkdir: created directory '/data/k8sdata/magedu/zookeeper-datadir-2'
mkdir: created directory '/data/k8sdata/magedu/zookeeper-datadir-3'
root@harbor:~# cat /etc/exports
# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check)
#
/data/k8sdata/kuboard *(rw,no_root_squash)
/data/volumes *(rw,no_root_squash)
/pod-vol *(rw,no_root_squash)
/data/k8sdata/myserver *(rw,no_root_squash)
/data/k8sdata/mysite *(rw,no_root_squash)
/data/k8sdata/magedu/images *(rw,no_root_squash)
/data/k8sdata/magedu/static *(rw,no_root_squash)
/data/k8sdata/magedu/zookeeper-datadir-1 *(rw,no_root_squash)
/data/k8sdata/magedu/zookeeper-datadir-2 *(rw,no_root_squash)
/data/k8sdata/magedu/zookeeper-datadir-3 *(rw,no_root_squash)
root@harbor:~# exportfs -av
exportfs: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/kuboard".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [2]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/volumes".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [3]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/pod-vol".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [4]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/myserver".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [5]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/mysite".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [7]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/images".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [8]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/static".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [11]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-1".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [12]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-2".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exportfs: /etc/exports [13]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-3".
Assuming default behaviour ('no_subtree_check').
NOTE: this default has changed since nfs-utils version 1.0.x
exporting *:/data/k8sdata/magedu/zookeeper-datadir-3
exporting *:/data/k8sdata/magedu/zookeeper-datadir-2
exporting *:/data/k8sdata/magedu/zookeeper-datadir-1
exporting *:/data/k8sdata/magedu/static
exporting *:/data/k8sdata/magedu/images
exporting *:/data/k8sdata/mysite
exporting *:/data/k8sdata/myserver
exporting *:/pod-vol
exporting *:/data/volumes
exporting *:/data/k8sdata/kuboard
root@harbor:~#
5.2、在k8s上创建pv
root@k8s-master01:~/k8s-data/yaml/magedu/zookeeper/pv# cat zookeeper-persistentvolume.yaml
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: zookeeper-datadir-pv-1
spec:
capacity:
storage: 20Gi
accessModes:
- ReadWriteOnce
nfs:
server: 192.168.0.42
path: /data/k8sdata/magedu/zookeeper-datadir-1
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: zookeeper-datadir-pv-2
spec:
capacity:
storage: 20Gi
accessModes:
- ReadWriteOnce
nfs:
server: 192.168.0.42
path: /data/k8sdata/magedu/zookeeper-datadir-2
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: zookeeper-datadir-pv-3
spec:
capacity:
storage: 20Gi
accessModes:
- ReadWriteOnce
nfs:
server: 192.168.0.42
path: /data/k8sdata/magedu/zookeeper-datadir-3
root@k8s-master01:~/k8s-data/yaml/magedu/zookeeper/pv#
5.3、在k8s上创建pvc
root@k8s-master01:~/k8s-data/yaml/magedu/zookeeper/pv# cat zookeeper-persistentvolumeclaim.yaml
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: zookeeper-datadir-pvc-1
namespace: magedu
spec:
accessModes:
- ReadWriteOnce
volumeName: zookeeper-datadir-pv-1
resources:
requests:
storage: 10Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: zookeeper-datadir-pvc-2
namespace: magedu
spec:
accessModes:
- ReadWriteOnce
volumeName: zookeeper-datadir-pv-2
resources:
requests:
storage: 10Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: zookeeper-datadir-pvc-3
namespace: magedu
spec:
accessModes:
- ReadWriteOnce
volumeName: zookeeper-datadir-pv-3
resources:
requests:
storage: 10Gi
root@k8s-master01:~/k8s-data/yaml/magedu/zookeeper/pv#
5.4、部署zk
root@k8s-master01:~/k8s-data/yaml/magedu/zookeeper# cat zookeeper.yaml
apiVersion: v1
kind: Service
metadata:
name: zookeeper
namespace: magedu
spec:
ports:
- name: client
port: 2181
selector:
app: zookeeper
---
apiVersion: v1
kind: Service
metadata:
name: zookeeper1
namespace: magedu
spec:
type: NodePort
ports:
- name: client
port: 2181
nodePort: 32181
- name: followers
port: 2888
- name: election
port: 3888
selector:
app: zookeeper
server-id: "1"
---
apiVersion: v1
kind: Service
metadata:
name: zookeeper2
namespace: magedu
spec:
type: NodePort
ports:
- name: client
port: 2181
nodePort: 32182
- name: followers
port: 2888
- name: election
port: 3888
selector:
app: zookeeper
server-id: "2"
---
apiVersion: v1
kind: Service
metadata:
name: zookeeper3
namespace: magedu
spec:
type: NodePort
ports:
- name: client
port: 2181
nodePort: 32183
- name: followers
port: 2888
- name: election
port: 3888
selector:
app: zookeeper
server-id: "3"
---
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
name: zookeeper1
namespace: magedu
spec:
replicas: 1
selector:
matchLabels:
app: zookeeper
template:
metadata:
labels:
app: zookeeper
server-id: "1"
spec:
volumes:
- name: data
emptyDir: {}
- name: wal
emptyDir:
medium: Memory
containers:
- name: server
image: harbor.ik8s.cc/magedu/zookeeper:v3.4.14
imagePullPolicy: Always
env:
- name: MYID
value: "1"
- name: SERVERS
value: "zookeeper1,zookeeper2,zookeeper3"
- name: JVMFLAGS
value: "-Xmx2G"
ports:
- containerPort: 2181
- containerPort: 2888
- containerPort: 3888
volumeMounts:
- mountPath: "/zookeeper/data"
name: zookeeper-datadir-pvc-1
volumes:
- name: zookeeper-datadir-pvc-1
persistentVolumeClaim:
claimName: zookeeper-datadir-pvc-1
---
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
name: zookeeper2
namespace: magedu
spec:
replicas: 1
selector:
matchLabels:
app: zookeeper
template:
metadata:
labels:
app: zookeeper
server-id: "2"
spec:
volumes:
- name: data
emptyDir: {}
- name: wal
emptyDir:
medium: Memory
containers:
- name: server
image: harbor.ik8s.cc/magedu/zookeeper:v3.4.14
imagePullPolicy: Always
env:
- name: MYID
value: "2"
- name: SERVERS
value: "zookeeper1,zookeeper2,zookeeper3"
- name: JVMFLAGS
value: "-Xmx2G"
ports:
- containerPort: 2181
- containerPort: 2888
- containerPort: 3888
volumeMounts:
- mountPath: "/zookeeper/data"
name: zookeeper-datadir-pvc-2
volumes:
- name: zookeeper-datadir-pvc-2
persistentVolumeClaim:
claimName: zookeeper-datadir-pvc-2
---
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
name: zookeeper3
namespace: magedu
spec:
replicas: 1
selector:
matchLabels:
app: zookeeper
template:
metadata:
labels:
app: zookeeper
server-id: "3"
spec:
volumes:
- name: data
emptyDir: {}
- name: wal
emptyDir:
medium: Memory
containers:
- name: server
image: harbor.ik8s.cc/magedu/zookeeper:v3.4.14
imagePullPolicy: Always
env:
- name: MYID
value: "3"
- name: SERVERS
value: "zookeeper1,zookeeper2,zookeeper3"
- name: JVMFLAGS
value: "-Xmx2G"
ports:
- containerPort: 2181
- containerPort: 2888
- containerPort: 3888
volumeMounts:
- mountPath: "/zookeeper/data"
name: zookeeper-datadir-pvc-3
volumes:
- name: zookeeper-datadir-pvc-3
persistentVolumeClaim:
claimName: zookeeper-datadir-pvc-3
root@k8s-master01:~/k8s-data/yaml/magedu/zookeeper#
上述部署清单，主要创建了4个svc和3个deploy控制器；其中一个svc是供客户端使用，其余三个svc主要用于内部集群通信使用，svc通过标签选择器（app: zookeeper 和server-id: “”来进行关联）和deploy控制器对应的pod进行一一关联；即service-zk1关联deploy-zk1,service-zk2关联deploy-zk2,service-zk3关联deploy-zk3;对于每个deploy控制下的zkpod通过挂载对应pvc来彼此隔离数据；即zk1挂载pvc1,zk2挂载pvc2，zk3挂载pvc3;
6、验证zookeeper集群状态
6.1、进入任意一个pod内部，查看集群角色和配置文件
可以看到集群配置正常生成，集群角色为follower；
6.2、停掉harbor服务，删除leader pod，看看对应zk集群是否会重新选举？
root@harbor:~# systemctl stop harbor
root@harbor:~#
zk集群在初始化时，所有节点数据都是没有的，所以选举leader就直接比较MYID，谁大谁就是leader；从上面的截图可以看到，我们把leader删除以后，对应zk集群会重新选举新的leader；
6.3、恢复harbor服务，再次删除zk3看看zk3是否还会恢复leader身份？
root@harbor:~# systemctl start harbor
root@harbor:~# systemctl status harbor
● harbor.service - Harbor
Loaded: loaded (/lib/systemd/system/harbor.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2023-06-04 12:02:00 UTC; 5s ago
Docs: http://github.com/vmware/harbor
Main PID: 186256 (docker-compose)
Tasks: 9 (limit: 4571)
Memory: 10.8M
CPU: 305ms
CGroup: /system.slice/harbor.service
└─186256 /usr/local/bin/docker-compose -f /app/harbor/docker-compose.yml up
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/controller/artifact/processor/processor.go:59]: the processor to>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023/06/04 12:02:06.283 [D] init global config instance failed. If you do not use this, just >
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/native/adapter.go:36]: the factory for adapter d>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/aliacr/adapter.go:30]: the factory for adapter a>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/awsecr/adapter.go:44]: the factory for adapter a>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/azurecr/adapter.go:29]: Factory for adapter azur>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/dockerhub/adapter.go:26]: Factory for adapter do>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/dtr/adapter.go:22]: the factory of dtr adapter w>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/githubcr/adapter.go:29]: the factory for adapter>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/gitlab/adapter.go:18]: the factory for adapter g>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/googlegcr/adapter.go:37]: the factory for adapte>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/harbor/adaper.go:31]: the factory for adapter ha>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/huawei/huawei_adapter.go:40]: the factory of Hua>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/jfrog/adapter.go:42]: the factory of jfrog artif>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/quay/adapter.go:53]: the factory of Quay adapter>
Jun 04 12:02:06 harbor.ik8s.cc docker-compose[186256]: harbor-jobservice | 2023-06-04T12:02:06Z [INFO] [/pkg/reg/adapter/tencentcr/adapter.go:41]: the factory for adapte>
root@harbor:~#
可以看到zk3加入集群以后，对应身份并不能直接变为leader，这是因为集群已经有一个leader存在；
作者：Linux-1874
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