info

这次是18.04  master 58; n1 59; n2 60 #Mon May 27 07:44:35 UTC 2019


每台机器最少2GB内存，2CPUs。
集群中所有机器之间网络连接正常。
打开相应的端口，详见： [ Check required ports https://kubernetes.io/docs/setup/independent/install-kubeadm/#check-required-ports]


Kubernetes要求集群中所有机器具有不同的Mac地址、产品uuid、Hostname。可以使用如下命令查看：

# UUID
 cat /sys/class/dmi/id/product_uuid

# Mac地址
 ip link

# Hostname
 cat /etc/hostname



ubuntu 16.04

master 67  allon vbox 
node1   66  node2   65

https://mirrors.163.com/ubuntu-releases/16.04.6/

使用kubeadm离线部署kubernetesv1.9.0

Set Hostname and update hosts file

sudo hostnamectl set-hostname "k8s-master"
sudo hostnamectl set-hostname k8s-node1
sudo hostnamectl set-hostname k8s-node2

#Add the following lines in /etc/hosts file on all three systems,

192.168.88.30     k8s-master
192.168.88.31     k8s-node1
192.168.88.32    k8s-node2


192.168.88.58     k8s-master #k8sumaster1
192.168.88.59     k8s-node1 #k8sun1
192.168.88.60    k8s-node2 #k8sun2

Ubuntu配置网络和hostname

翻墙

Ubuntu利用shadowsocks和polipo终端翻墙


cat /etc/profile
#这个如何自启动加载呢 不然 notready
export http_proxy="http://127.0.0.1:8123/"
export https_proxy=$http_proxy
#export no_proxy="localhost,127.0.0.1,192.168.88.58,10.96.0.0,10.224.0.0"
 export no_proxy="localhost,127.0.0.1,192.168.88.58,10.96.0.0,10.224.0.0,10.224.*"

如果不想翻墙请参考使用Kubeadm搭建Kubernetes(1.12.2)集群

ins docker

apt-get install docker.io -y #only 4 ubuntu

debian9

.Install using the repository on debian


apt-get remove docker docker-engine docker.io containerd runc

sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg2 \
    software-properties-common

 curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

 sudo apt-key fingerprint 0EBFCD88
 sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/debian \
   $(lsb_release -cs) \
   stable"
 apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

2.install-from-a-package on debian

Go to https://download.docker.com/linux/debian/dists/, choose your Debian version, browse to pool/stable/, choose either amd64 or armhf, and download the .deb file for the Docker CE version you want to install.

I am stretch so

apt install libltdl7

http://mirrors.aliyun.com/docker-ce/linux/debian/dists/stretch/pool/stable/amd64/

Docker入门

docker代理设置


#不要少了开头的service 还要记得check一个代理成功不
mkdir -p /etc/systemd/system/docker.service.d
vi /etc/systemd/system/docker.service.d/http-proxy.conf

[Service]
Environment="HTTPS_PROXY=http://127.0.0.1:8123/" "HTTP_PROXY=http://127.0.0.1:8123/" "NO_PROXY=localhost,127.0.0.1,192.168.88.67,10.96.0.0,10.224.0.0"

#Environment="HTTP_PROXY=http://proxy.example.com:80/" "HTTPS_PROXY=http://proxy.example.com:80/""NO_PROXY=localhost,127.0.0.1,docker-registry.somecorporation.com"

systemctl daemon-reload
systemctl restart docker 
systemctl enable docker

systemctl show --property=Environment docker


other
evan@k8s-master:~$ sudo systemctl enable docker 
Synchronizing state of docker.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable docker

docker http-proxy

docker 代理设置

docker代理配置-透过代理服务器pull镜像

docker pull 翻墙下载镜像

docker设置代理

docker - 设置HTTP/HTTPS 代理

ins 在所有节点上


swapoff -a;  sudo usermod -a -G docker $USER

apt-get update && apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl
apt-mark hold kubelet kubeadm kubectl


#init  之前不要启动
#systemctl start kubelet&&  systemctl enable kubelet.service


启动不了
原来是kubelet 的cgroup dirver 与 docker的不一样。docker默认使用cgroupfs,keubelet 默认使用systemd。

https://kubernetes.io/docs/setup/cri/
#这个有改的 18.04上成功了的
vim /etc/systemd/system/kubelet.service.d/10-kubeadm.conf 
[Service]
Environment="KUBELET_AUTHZ_ARGS=--authorization-mode=Webhook --client-ca-file=/etc/kubernetes/pki/ca.crt"
Environment="KUBELET_CADVISOR_ARGS=--cadvisor-port=0"
Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=cgroupfs"

systemctl daemon-reload && systemctl restart kubelet &&  systemctl enable kubelet.service

在 Master 节点上配置 kubelet 所需的 cgroup 驱动

使用 Docker 时，kubeadm 会自动为其检测 cgroup 驱动在运行时对 /var/lib/kubelet/kubeadm-flags.env 文件进行配置。 
如果您使用了不同的 CRI， 您得把 /etc/default/kubelet 文件中的 cgroup-driver 位置改为对应的值，像这样：

KUBELET_EXTRA_ARGS=--cgroup-driver=<value>

这个文件将会被 kubeadm init 和 kubeadm join 用于为 kubelet 获取 额外的用户参数。

请注意，您只需要在您的 cgroup driver 不是 cgroupfs 时这么做，因为 cgroupfs 已经是 kubelet 的默认值了。

systemctl daemon-reload; systemctl restart kubelet #需要重启 kubelet：

#me 
evan@k8s-master:~$ cat /var/lib/kubelet/kubeadm-flags.env 
KUBELET_KUBEADM_ARGS=--cgroup-driver=cgroupfs --network-plugin=cni --pod-infra-container-image=k8s.gcr.io/pause:3.1 --resolv-conf=/run/systemd/resolve/resolv.conf

初始化master

 #14:25:52--14:47:55 kubelet 其实是没启动的 在init之前 
 kubeadm init   --apiserver-advertise-address=192.168.88.30  --pod-network-cidr=10.224.0.0/16 # --apiserver-advertise-address=masterip

kubeadm join 192.168.88.58:6443 --token fuwhe0.ro0c8u82u4xtmn8q \
    --discovery-token-ca-cert-hash sha256:83bd9c19486c44fde674f4ccf0a7382848cd7bfeff8c361d54e7a2955a4dbd60





Alternatively, if you are the root user, you can run:

export KUBECONFIG=/etc/kubernetes/admin.conf



另外有一个小技巧，在init的过程中，另开一个终端，运行

journalctl -f -u kubelet.service

可以查看具体是什么愿意卡住了

配置kubectl认证信息

cat  /etc/sudoers.d/evan
echo 'evan ALL=(ALL) NOPASSWD:NOPASSWD:ALL' > /etc/sudoers.d/evan

su - evan 
mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
echo "source <(kubectl completion bash)" >> ~/.bashrc
exit 

# 对于root用户 这省不能少 不然  #  kubectl  apply -f kube-flannel.yml  The connection to the server localhost:8080 was refused - did you specify the right host or port?

export KUBECONFIG=/etc/kubernetes/admin.conf
#也可以直接放到~/.bash_profile
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

安装pod网络on master

普通用户不要翻墙

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

添加节点

不要翻墙了新起个窗口

kubeadm join 192.168.88.58:6443 --token fuwhe0.ro0c8u82u4xtmn8q \
    --discovery-token-ca-cert-hash sha256:83bd9c19486c44fde674f4ccf0a7382848cd7bfeff8c361d54e7a2955a4dbd60 



evan@k8s-master:~$ kubectl get nodes
NAME   STATUS     ROLES    AGE     VERSION
k8s    NotReady   master   5h12m   v1.14.2
u16    NotReady   <none>   106m    v1.14.2

evan@k8s-master:~$ kubectl get pod --all-namespaces
NAMESPACE     NAME                          READY   STATUS              RESTARTS   AGE
kube-system   coredns-fb8b8dccf-nprqq       0/1     Terminating         16         5h11m
kube-system   coredns-fb8b8dccf-qn85f       0/1     Pending             0          5m4s
kube-system   coredns-fb8b8dccf-sgtw4       0/1     Terminating         16         5h11m
kube-system   coredns-fb8b8dccf-wsnkg       0/1     Pending             0          5m5s
kube-system   etcd-k8s                      1/1     Running             0          5h11m
kube-system   kube-apiserver-k8s            1/1     Running             0          5h11m
kube-system   kube-controller-manager-k8s   1/1     Running             0          5h11m
kube-system   kube-flannel-ds-amd64-8vvn6   0/1     Init:0/1            0          107m
kube-system   kube-flannel-ds-amd64-q92vz   1/1     Running             0          112m
kube-system   kube-proxy-85vkt              0/1     ContainerCreating   0          107m
kube-system   kube-proxy-fr7lv              1/1     Running             0          5h11m
kube-system   kube-scheduler-k8s            1/1     Running             0          5h11m


evan@k8s-master:~$ kubectl describe pod  kube-proxy-85vkt  --namespace=kube-system
Name:               kube-proxy-85vkt
Namespace:          kube-system
Priority:           2000001000
PriorityClassName:  system-node-critical
Node:               u16/192.168.88.66
****

Events:
  Type     Reason                  Age                   From               Message
  ----     ------                  ----                  ----               -------
  Normal   Scheduled               109m                  default-scheduler  Successfully assigned kube-system/kube-proxy-85vkt to u16
  Normal   Pulling                 108m                  kubelet, u16       Pulling image "k8s.gcr.io/kube-proxy:v1.14.2"
  Normal   Pulled                  107m                  kubelet, u16       Successfully pulled image "k8s.gcr.io/kube-proxy:v1.14.2"
  Normal   Created                 107m                  kubelet, u16       Created container kube-proxy
  Normal   Started                 107m                  kubelet, u16       Started container kube-proxy
  Warning  FailedCreatePodSandBox  52m (x119 over 107m)  kubelet, u16       Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Error response from daemon: Get https://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

放了一个晚上 早上还是坏的 突然打开已是好的了

evan@ubuntu18:~$ kubectl get pod --all-namespaces
NAMESPACE     NAME                               READY   STATUS    RESTARTS   AGE
kube-system   coredns-fb8b8dccf-2rbwc            1/1     Running   3          18h
kube-system   coredns-fb8b8dccf-67zc2            1/1     Running   3          18h
kube-system   etcd-ubuntu18                      1/1     Running   10         18h
kube-system   kube-apiserver-ubuntu18            1/1     Running   4          18h
kube-system   kube-controller-manager-ubuntu18   1/1     Running   5          18h
kube-system   kube-flannel-ds-amd64-b6bn8        1/1     Running   45         16h
kube-system   kube-flannel-ds-amd64-v9wxm        1/1     Running   46         16h
kube-system   kube-flannel-ds-amd64-zn4xd        1/1     Running   3          16h
kube-system   kube-proxy-d7pmb                   1/1     Running   4          18h
kube-system   kube-proxy-gcddr                   1/1     Running   0          16h
kube-system   kube-proxy-lv8cb                   1/1     Running   0          16h
kube-system   kube-scheduler-ubuntu18            1/1     Running   5          18h



master 也当作node  这里的master hostname 为	ubuntu18OB
evan@ubuntu18:~$ kubectl  taint node ubuntu18 node-role.kubernetes.io/master-
node/ubuntu18 untainted

#master only
kubectl  taint node ubuntu18 node-role.kubernetes.io/master="":NoSchedule

master 也当作node

 [root@master tomcat]# hostname
master
[root@master tomcat]# kubectl taint node master node-role.kubernetes.io/master-
node/master untainted

下面的是不是可以不要翻墙了呢

chpater4 k8s architecture

#唯一不是容器形式运行的k8s 组件
evan@k8s-master:~$ sudo systemctl status kubelet.service
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Mon 2019-05-27 07:26:18 UTC; 21min ago
     Docs: https://kubernetes.io/docs/home/
 Main PID: 817 (kubelet)
    Tasks: 19 (limit: 3499)
   CGroup: /system.slice/kubelet.service
           └─817 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf -



在master节点上发起个创建应用请求 
这里我们创建个名为httpd-app的应用，镜像为httpd，有两个副本pod
evan@k8s-master:~$ kubectl run httpd-app --image=httpd --replicas=2
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/httpd-app created

evan@k8s-master:~$ kubectl get deployment
NAME        READY   UP-TO-DATE   AVAILABLE   AGE
httpd-app   0/2     2            0           103s

evan@k8s-master:~$ kubectl get pods -o wide
NAME                         READY   STATUS              RESTARTS   AGE     IP       NODE        NOMINATED NODE   READINESS GATES
httpd-app-6df58645c6-bvg9w   0/1     ContainerCreating   0          2m10s   <none>   k8s-node1   <none>           <none>
httpd-app-6df58645c6-n9xdj   0/1     ContainerCreating   0          2m10s   <none>   k8s-node2   <none>           <none>

evan@k8s-master:~$ kubectl get pods -o wide
NAME                         READY   STATUS              RESTARTS   AGE     IP           NODE        NOMINATED NODE   READINESS GATES
httpd-app-6df58645c6-bvg9w   0/1     ContainerCreating   0          3m58s   <none>       k8s-node1   <none>           <none>
httpd-app-6df58645c6-n9xdj   1/1     Running             0          3m58s   10.224.1.2   k8s-node2   <none>           <none>
#OK了
evan@k8s-master:~$ kubectl get pods -o wide
NAME                         READY   STATUS    RESTARTS   AGE    IP           NODE        NOMINATED NODE   READINESS GATES
httpd-app-6df58645c6-bvg9w   1/1     Running   0          6m8s   10.224.2.3   k8s-node1   <none>           <none>
httpd-app-6df58645c6-n9xdj   1/1     Running   0          6m8s   10.224.1.2   k8s-node2   <none>           <none>

下面关闭ss docker 代理 polipo

chapter 5 run apps

evan@k8s-master:~$ kubectl run nginx-deployment --image=nginx:1.7.9 --replicas=2
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/nginx-deployment created

上面的命令将部署包含两个副本的 Deployment nginx-deployment，容器的 image 为 nginx:1.7.9。

等待一段时间
kubectl get deployment nginx-deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   2/2     2            2           36m


接下来我们用 kubectl describe deployment 了解更详细的信息

等待

sudo  sslocal -c /root/shadowsocks.json -d start
 sslocal -c shadowsocks.json -d start
sslocal -c shadowsocks.json -d start

进阶

K8S 源码探秘之 kubeadm init 执行流程分析

kubeadm--init

安装k8s Master高可用集群

What is new

在Kubernetes 1.11中，CoreDNS已经实现了基于DNS的服务发现的GA，可作为kube-dns插件的替代品。这意味着CoreDNS将作为各种安装工具未来发布版本中的一个选项来提供。事实上，kubeadm团队选择将其作为Kubernetes 1.11的默认选项。

CoreDNS正式GA | kube-dns与CoreDNS有何差异？

k8s集群配置使用coredns代替kube-dns

trouble

Kubenetes服务不启动问题

重启系统后，发现kubelet服务没有起来，首先检查：

 1.vim  /etc/fstab
#注释掉里面的swap一行。

2
/etc/systemd/system/kubelet.service.d/10-kubeadm.conf 文件加入KUBELET_CGROUP_ARGS和KUBELET_EXTRA_ARGS参数，


3.注意在启动参数中也要加入，如下：
[Service]

Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=systemd"
Environment="KUBELET_EXTRA_ARGS=--fail-swap-on=false"

ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_SYSTEM_PODS_ARGS $KUBELET_NETWORK_ARGS $KUBELET_DNS_ARGS $KUBELET_AUTHZ_ARGS $KUBELET_CADVISOR_ARGS $KUBELET_CERTIFICATE_ARGS $KUBELET_CGROUP_ARGS $KUBELET_EXTRA_ARGS

systemctl daemon-reload
systemctl restart kubelet

trouble2 重启一下机器就坏

为什么重启一下机器就坏了呢

systemctl  status  kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: activating (auto-restart) (Result: exit-code) since Fri 2019-05-24 20:27:22 CST; 1s ago
     Docs: https://kubernetes.io/docs/home/
  Process: 1889 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (cod
 Main PID: 1889 (code=exited, status=255)



kubelet.service: Main process exited, code=exited, status=255


journalctl -xefu kubelet

原来是kubelet 的cgroup dirver 与 docker的不一样。docker默认使用cgroupfs,keubelet 默认使用systemd。


简单地说就是在kubeadm init 之前kubelet会不断重启。


[kubelet-check] Initial timeout of 40s passed.

Unfortunately, an error has occurred:
	timed out waiting for the condition

This error is likely caused by:
	- The kubelet is not running
	- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)

If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:
	- 'systemctl status kubelet'
	- 'journalctl -xeu kubelet'


在集群初始化遇到问题，可以使用下面的命令进行清理后重新再初始化：

kubeadm reset
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm -rf /var/lib/cni/

K8S 初始化问题，有哪位遇到过，求解！timed out waiting for the condition

trouble3

evan@k8s-master:~$ docker pull gcr.io/kubernetes-helm/tiller:v2.14.0
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.39/images/create?fromImage=gcr.io%2Fkubernetes-helm%2Ftiller&tag=v2.14.0: dial unix /var/run/docker.sock: connect: permission denied


    sudo usermod -a -G docker $USER #普通用户添加天docker 组

Docker pull Get Permission Denied

trouble 3

docker  223.6.6.6 有时有问题 建议用8.8.4.4

Install and Configure Kubernetes (k8s) on ubuntu

目录

info

Set Hostname and update hosts file

翻墙

ins docker

debian9

.Install using the repository on debian

2.install-from-a-package on debian

docker代理设置

ins 在所有节点上

在 Master 节点上配置 kubelet 所需的 cgroup 驱动

初始化master

配置kubectl认证信息

安装pod网络on master

添加节点

master 也当作node

下面的是不是可以不要翻墙了呢

chpater4 k8s architecture

下面关闭ss docker 代理 polipo

chapter 5 run apps

等待

进阶

What is new

trouble

Kubenetes服务不启动问题

trouble2 重启一下机器就坏

trouble3

trouble 3

see also

导航菜单

个人工具

名字空间

变种

视图

更多

搜索

导航

我的导航

工具

Install and Configure Kubernetes (k8s) on ubuntu

目录

info

Set Hostname and update hosts file

翻墙

ins docker

debian9

.Install using the repository on debian

2.install-from-a-package on debian

docker代理设置

ins 在所有节点上

在 Master 节点上配置 kubelet 所需的 cgroup 驱动

初始化master

配置kubectl认证信息

安装pod网络on master

添加节点

master 也当作node

下面的是不是可以不要翻墙了呢

chpater4 k8s architecture

下面 关闭ss docker 代理 polipo

chapter 5 run apps

等待

进阶

What is new

trouble

Kubenetes服务不启动问题

trouble2 重启一下机器就坏

trouble3

trouble 3

see also

导航菜单

搜索

下面关闭ss docker 代理 polipo