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Linux系統安裝單機版K8S

關閉防火牆和Selinux。 
[root@localhost ~]# setenforce 0 
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld

Selinux永久關閉：

[root@localhost k8s]# cat /etc/selinux/config

調整為：SELINUX=disabled

網易YUM源

CentOS-Base.repo檔案内容：

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - 163.com
baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

docker-ce.repo檔案内容如下：

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-debuginfo]
name=Docker CE Stable - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-source]
name=Docker CE Stable - Sources
baseurl=https://download.docker.com/linux/centos/7/source/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge]
name=Docker CE Edge - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge-debuginfo]
name=Docker CE Edge - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge-source]
name=Docker CE Edge - Sources
baseurl=https://download.docker.com/linux/centos/7/source/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test]
name=Docker CE Test - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test-debuginfo]
name=Docker CE Test - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test-source]
name=Docker CE Test - Sources
baseurl=https://download.docker.com/linux/centos/7/source/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-nightly]
name=Docker CE Nightly - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/nightly
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-nightly-debuginfo]
name=Docker CE Nightly - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/nightly
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-nightly-source]
name=Docker CE Nightly - Sources
baseurl=https://download.docker.com/linux/centos/7/source/nightly
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

配置完畢：

[root@localhost ~]# yum clean all
[root@localhost ~]# yum makecache
配置EPEL源 
[root@localhost ~]# yum install -y epel-release 
 [root@localhost ~]# yum update
安裝 
[root@localhost ~]#  yum install -y  etcd kubernetes
修改配置檔案 
1：修改/etc/sysconfig/docker，其中OPTIONS的内容設定為
OPTIONS='--selinux-enabled=false --insecure-registry gcy.io --log-driver=journald'
2：修改/etc/kubernetes/apiserver，把--admission_control參數中的ServiceAccount删除。
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
安裝順序啟動以下服務 
[root@localhost ~]# systemctl start etcd
[root@localhost ~]# systemctl start docker 
[root@localhost ~]# systemctl start kube-apiserver
[root@localhost ~]# systemctl start kube-controller-manager
[root@localhost ~]# systemctl start kube-scheduler
[root@localhost ~]# systemctl start kubelet
[root@localhost ~]# systemctl start kube-proxy

[root@localhost ~]# systemctl enable etcd
[root@localhost ~]# systemctl enable docker 
[root@localhost ~]# systemctl enable kube-apiserver
[root@localhost ~]# systemctl enable kube-controller-manager
[root@localhost ~]# systemctl enable kube-scheduler
[root@localhost ~]# systemctl enable kubelet
[root@localhost ~]# systemctl enable kube-proxy
mysql-rc.yaml配置檔案 
apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"      
[root@localhost ~]# kuberctl create -f mysql-rc.yaml
[root@localhost ~]# kbuerctl get pod

POD處于ContainerCreating

運作容器的時候，發現一直處于ContainerCreating狀态，一是網絡不通，二是沒有找到證書檔案：

[root@localhost ~]#yum install *rhsm* -y

修改docker源:​

​vim /etc/docker/daemon.json​

​

{
"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]
}

執行指令：​

​kubectl log pod mysql-706nr​

​

錯誤資訊如下：

Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"registry.access.redhat.com/rhel7/pod-infrastructure:latest""

手動下載下傳

[root@localhost ~]# docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest 
Trying to pull repository registry.access.redhat.com/rhel7/pod-infrastructure … 
open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory 
[root@master ~]#

可以執行如下指令：

[root@localhost k8s]# yum install -y wget 
[root@localhost k8s]# wget http://mirror.centos.org/centos/7/os/x86_64/Packages/python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm
[root@localhost k8s]# rpm2cpio python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm | cpio -iv --to-stdout ./etc/rhsm/ca/redhat-uep.pem | tee /etc/rhsm/ca/redhat-uep.pem

這兩個指令會生成/etc/rhsm/ca/redhat-uep.pem檔案。順得的話會得到下面的結果。

[root@localhost]# docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest
Trying to pull repository registry.access.redhat.com/rhel7/pod-infrastructure ...
latest: Pulling from registry.access.redhat.com/rhel7/pod-infrastructure
26e5ed6899db: Pull complete
66dbe984a319: Pull complete
9138e7863e08: Pull complete
Digest: sha256:92d43c37297da3ab187fc2b9e9ebfb243c1110d446c783ae1b989088495db931
Status: Downloaded newer image for registry.access.redhat.com/rhel7/pod-infrastructure:latest

不過該指令有點慢，可以在百度雲下該鏡像tar包：​​pod-infrastructure.tar​​

提取碼：xorj

下載下傳完畢之後，執行指令加載鏡像：​​

​docker load -i pod-infrastructure.tar​

​

執行完畢之後，執行

[root@localhost k8s]# kubectl get pods
NAME          READY     STATUS    RESTARTS   AGE
mysql-21cct   1/1       Running   0          2m
[root@localhost k8s]#
k8s Linux 單機 WEL測試 Docker
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