kubernetes集群备份恢复 kubernetes集群数据存储

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mob64ca13fe62db 2024-08-29 19:39:05

文章标签 kubernetes集群备份恢复运维网络数据库 centos 文章分类 kubernetes 云计算

上文我们在一台虚机上演示了Kubernetes基于redis和docker的guestbook留言簿案例，本文我们将通过配置Kubernetes集群的方式继续深入研究。集群组件安装如下配置。

IP	NAME	Component
192.168.56.103	centos-master	etcd,kube-apiserver,kube-controller-manager,kube-scheduler
192.168.56.105	centos-node01	kube-proxy,kubelet,docker
192.168.56.107	centos-node02	kube-proxy,kubelet,docker

主机环境：centos 7，三台虚机。

1.准备工作
以下工作在每台虚机执行。
1.1 停止防火墙
#systemctl disable firewalld
#systemctl stop firewalld

1.2 修改iptables

yum install iptables-services
vi /etc/sysconfig/iptables把icmp-host-prohibited两条注释掉

# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
#-A INPUT -j REJECT --reject-with icmp-host-prohibited
#-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

重启iptables
#systemctl restart iptables

1.3 使用阿里镜像(或other)
#wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

1.4 更新主机列表

#echo "192.168.56.103 CentOS7.2

192.168.56.105 CentOS7-1

192.168.56.107 CentOS7-2" >> /etc/hosts

2.安装配置kubernetes master
2.1 在centos-master上安装
#yum install kubernetes-master
#yum install etcd

2.2配置 Kubernetes services
#vi /etc/kubernetes/config

###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
#   kube-apiserver.service
#   kube-controller-manager.service
#   kube-scheduler.service
#   kubelet.service
#   kube-proxy.service
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"
# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"
# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"
# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://centos-master:8080"

2.3配置Kubernetes API server
#vi /etc/kubernetes/apiserver

###
# kubernetes system config
#
# The following values are used to configure the kube-apiserver
#
# The address on the local server to listen to.
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
# The port on the local server to listen on.
KUBE_API_PORT="--insecure-port=8080"
# Port minions listen on
#KUBELET_PORT="--kubelet-port=10250"
# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"
# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
# default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
# Add your own!
KUBE_API_ARGS=""

2.4 启动服务

for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do 
    systemctl restart $SERVICES
    systemctl enable $SERVICES
    systemctl status $SERVICES 
done

2.5 停止服务

for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do 
    systemctl stop $SERVICES
done

3.安装配置kubernetes node
3.1 在centos-node01及centos-node02上安装
#yum install kubernetes-node
#vi /etc/kubernetes/config

###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
#   kube-apiserver.service
#   kube-controller-manager.service
#   kube-scheduler.service
#   kubelet.service
#   kube-proxy.service
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"
# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"
# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"
# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://centos-master:8080"

3.2 配置 kubelet文件
vi /etc/kubernetes/kubelet
centos-node01

###
# kubernetes kubelet (minion) config

# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
KUBELET_ADDRESS="--address=0.0.0.0"

# The port for the info server to serve on
KUBELET_PORT="--port=10250"

# You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname-override=centos-minion01"

# location of the api-server
KUBELET_API_SERVER="--api-servers=http://centos-master:8080"

# pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

# Add your own!
KUBELET_ARGS=""

centos-node02

###

# kubernetes kubelet (minion) config
# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
KUBELET_ADDRESS="--address=0.0.0.0"
# The port for the info server to serve on
KUBELET_PORT="--port=10250"
# You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname-override=centos-minion02"
# location of the api-server
KUBELET_API_SERVER="--api-servers=http://centos-master:8080"
# pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
# Add your own!
KUBELET_ARGS=""

3.3 配置config文件

vi /etc/kubernetes/config

###
# kubernetes system config
#
# The following values are used to configure various aspects of all
# kubernetes services, including
#
#   kube-apiserver.service
#   kube-controller-manager.service
#   kube-scheduler.service
#   kubelet.service
#   kube-proxy.service
# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"

# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=false"

# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://centos-master:8080"

3.4 启动服务

for SERVICES in kube-proxy kubelet docker; do 
    systemctl restart $SERVICES
    systemctl enable $SERVICES
    systemctl status $SERVICES 
done

在centos-node01上启动

[root@centos-minion01 ~]# for SERVICES in kube-proxy kubelet docker; do
>     systemctl restart $SERVICES
>     systemctl enable $SERVICES
>     systemctl status $SERVICES
> done

在centos-minion02上启动

[root@centos-minion02 kubernetes]# for SERVICES in kube-proxy kubelet docker; do
>     systemctl restart $SERVICES
>     systemctl enable $SERVICES
>     systemctl status $SERVICES
> done

3.5 停止服务

for SERVICES in kube-proxy kubelet docker; do 
    systemctl stop $SERVICES 
done

4. 检查及确认状态
#kubectl get nodes
#kubectl cluster-info
我们看到2个节点都正常启动。

[root@CentOS7 yum.repos.d]# kubectl get nodes

NAME        LABELS                                          STATUS    AGE
127.0.0.1   kubernetes.io/hostname=127.0.0.1   Ready     15d
centos7-1   kubernetes.io/hostname=centos7-1   Ready     4m
centos7-2   kubernetes.io/hostname=centos7-2   Ready     4m
[root@CentOS7 yum.repos.d]# kubectl cluster-info
Kubernetes master is running at http://localhost:8080

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