本文共 18299 字，大约阅读时间需要 60 分钟。

一、问题描述及相关提示：

在命令行输入# kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=NumCPU 后，会提示镜像无法获取

[root@master ~]# kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=NumCPU

W0915 04:09:11.676468    2925 version.go:98] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) W0915 04:09:11.676529    2925 version.go:99] falling back to the local client version: v1.15.3 [init] Using Kubernetes version: v1.15.3 [preflight] Running pre-flight checks [preflight] Pulling images required for setting up a Kubernetes cluster [preflight] This might take a minute or two, depending on the speed of your internet connection [preflight] You can also perform this action in beforehand using 'kubeadm config images pull' error execution phase preflight: [preflight] Some fatal errors occurred:         [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.15.3: output: Trying to pull repository k8s.gcr.io/kube-apiserver ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1         [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.15.3: output: Trying to pull repository k8s.gcr.io/kube-controller-manager ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1         [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-scheduler:v1.15.3: output: Trying to pull repository k8s.gcr.io/kube-scheduler ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1         [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-proxy:v1.15.3: output: Trying to pull repository k8s.gcr.io/kube-proxy ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1         [ERROR ImagePull]: failed to pull image k8s.gcr.io/pause:3.1: output: Trying to pull repository k8s.gcr.io/pause ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1         [ERROR ImagePull]: failed to pull image k8s.gcr.io/etcd:3.3.10: output: Trying to pull repository k8s.gcr.io/etcd ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1         [ERROR ImagePull]: failed to pull image k8s.gcr.io/coredns:1.3.1: output: Trying to pull repository k8s.gcr.io/coredns ... Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused , error: exit status 1 [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`  

二、问题解决方案

1、   如一所示，我将提示复制到一个文件里面（此处是require.txt),然后用awk、grep、cut等命令过滤出我想要的格式：如下所示

[root@master ~]# awk -F" " '{print $7}' require.txt | grep -v "^$" | grep -v "connection" |grep -v "fatal"| cut -d ":" -f 1,2

k8s.gcr.io/kube-apiserver:v1.15.3

k8s.gcr.io/kube-controller-manager:v1.15.3

k8s.gcr.io/kube-scheduler:v1.15.3

k8s.gcr.io/kube-proxy:v1.15.3

k8s.gcr.io/pause:3.1

k8s.gcr.io/etcd:3.3.10

k8s.gcr.io/coredns:1.3.1

2、接下来就是将需要的镜像保存到文件里然后读取文件，用for循环来拉取相应的镜像

[root@master ~]# awk -F" " '{print $7}' require.txt | grep -v "^$" | grep -v "connection" |grep -v "fatal"| cut -d ":" -f 1,2 >require.sh

[root@master ~]# cat require.sh

k8s.gcr.io/kube-apiserver:v1.15.3 k8s.gcr.io/kube-controller-manager:v1.15.3 k8s.gcr.io/kube-scheduler:v1.15.3 k8s.gcr.io/kube-proxy:v1.15.3 k8s.gcr.io/pause:3.1 k8s.gcr.io/etcd:3.3.10 k8s.gcr.io/coredns:1.3.1 [root@master ~]# cp require.sh require2.sh [root@master ~]# sed -i '/k8s.gcr.io/registry.aliyuncs.com/google_containers/g' require2.sh [root@master ~]# cat require2.sh k8s.gcr.io/kube-apiserver:v1.15.3 k8s.gcr.io/kube-controller-manager:v1.15.3 k8s.gcr.io/kube-scheduler:v1.15.3 k8s.gcr.io/kube-proxy:v1.15.3 k8s.gcr.io/pause:3.1 k8s.gcr.io/etcd:3.3.10 k8s.gcr.io/coredns:1.3.1 [root@master ~]# sed -i 's/k8s.gcr.io/registry.aliyuncs.com/google_containers/g' require2.sh sed: -e expression #1, char 37: unknown option to `s' [root@master ~]# sed -i 's/k8s.gcr.io/registry.aliyuncs.com\/google_containers/g' require2.sh [root@master ~]# cat require2.sh registry.aliyuncs.com/google_containers/kube-apiserver:v1.15.3 registry.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3 registry.aliyuncs.com/google_containers/kube-scheduler:v1.15.3 registry.aliyuncs.com/google_containers/kube-proxy:v1.15.3 registry.aliyuncs.com/google_containers/pause:3.1 registry.aliyuncs.com/google_containers/etcd:3.3.10 registry.aliyuncs.com/google_containers/coredns:1.3.1 [root@master ~]# for i in `cat require2.sh`;do echo $i;done registry.aliyuncs.com/google_containers/kube-apiserver:v1.15.3 registry.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3 registry.aliyuncs.com/google_containers/kube-scheduler:v1.15.3 registry.aliyuncs.com/google_containers/kube-proxy:v1.15.3 registry.aliyuncs.com/google_containers/pause:3.1 registry.aliyuncs.com/google_containers/etcd:3.3.10 registry.aliyuncs.com/google_containers/coredns:1.3.1 [root@master ~]# for i in `cat require2.sh`;do docker pull $i;done Trying to pull repository registry.aliyuncs.com/google_containers/kube-apiserver ... v1.15.3: Pulling from registry.aliyuncs.com/google_containers/kube-apiserver 39fafc05754f: Pull complete b329b37f08d3: Pull complete Digest: sha256:a21bcbcd23f7dbc6a331583645b56e639ec256cc6e2283a647ddd86505a4783e Status: Downloaded newer image for registry.aliyuncs.com/google_containers/kube-apiserver:v1.15.3 Trying to pull repository registry.aliyuncs.com/google_containers/kube-controller-manager ... v1.15.3: Pulling from registry.aliyuncs.com/google_containers/kube-controller-manager 39fafc05754f: Already exists ea7b418624d2: Pull complete Digest: sha256:f84c849e3c2105136b210d31018e3050744817a993d3c7b9f5ce3a03b0d82ff5 Status: Downloaded newer image for registry.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3 Trying to pull repository registry.aliyuncs.com/google_containers/kube-scheduler ... v1.15.3: Pulling from registry.aliyuncs.com/google_containers/kube-scheduler 39fafc05754f: Already exists f506ab803e71: Pull complete Digest: sha256:77a630518b31525d85e9de3b4946eb0a54c9df56960a4056925ac14bb1d12a97 Status: Downloaded newer image for registry.aliyuncs.com/google_containers/kube-scheduler:v1.15.3 Trying to pull repository registry.aliyuncs.com/google_containers/kube-proxy ... v1.15.3: Pulling from registry.aliyuncs.com/google_containers/kube-proxy 39fafc05754f: Already exists db3f71d0eb90: Pull complete ed8f57f30bde: Pull complete Digest: sha256:fbeb72931327b1d66b6d481bc0e0a8c531a055432fc01ef28012d5746ad07877 Status: Downloaded newer image for registry.aliyuncs.com/google_containers/kube-proxy:v1.15.3 Trying to pull repository registry.aliyuncs.com/google_containers/pause ... 3.1: Pulling from registry.aliyuncs.com/google_containers/pause cf9202429979: Pull complete Digest: sha256:759c3f0f6493093a9043cc813092290af69029699ade0e3dbe024e968fcb7cca Status: Downloaded newer image for registry.aliyuncs.com/google_containers/pause:3.1 Trying to pull repository registry.aliyuncs.com/google_containers/etcd ... 3.3.10: Pulling from registry.aliyuncs.com/google_containers/etcd 90e01955edcd: Pull complete 6369547c492e: Pull complete bd2b173236d3: Pull complete Digest: sha256:240bd81c2f54873804363665c5d1a9b8e06ec5c63cfc181e026ddec1d81585bb Status: Downloaded newer image for registry.aliyuncs.com/google_containers/etcd:3.3.10 Trying to pull repository registry.aliyuncs.com/google_containers/coredns ... 1.3.1: Pulling from registry.aliyuncs.com/google_containers/coredns e0daa8927b68: Pull complete 3928e47de029: Pull complete Digest: sha256:638adb0319813f2479ba3642bbe37136db8cf363b48fb3eb7dc8db634d8d5a5b Status: Downloaded newer image for registry.aliyuncs.com/google_containers/coredns:1.3.1

至此需要的镜像都已经拉取下来了，可以用#docker images查看

[root@master ~]# docker images REPOSITORY                                                        TAG                 IMAGE ID            CREATED             SIZE registry.aliyuncs.com/google_containers/kube-proxy                v1.15.3             232b5c793146        3 weeks ago         82.4 MB registry.aliyuncs.com/google_containers/kube-apiserver            v1.15.3             5eb2d3fc7a44        3 weeks ago         207 MB registry.aliyuncs.com/google_containers/kube-controller-manager   v1.15.3             e77c31de5547        3 weeks ago         159 MB registry.aliyuncs.com/google_containers/kube-scheduler            v1.15.3             703f9c69a5d5        3 weeks ago         81.1 MB registry.aliyuncs.com/google_containers/coredns                   1.3.1               eb516548c180        8 months ago        40.3 MB registry.aliyuncs.com/google_containers/etcd                      3.3.10              2c4adeb21b4f        9 months ago        258 MB registry.aliyuncs.com/google_containers/pause                     3.1                 da86e6ba6ca1        21 months ago       742 kB3、对拉取的镜像打tag，变为问题提示的那种格式，即k8s.gcr.io/的格式。

此处由于docker tag 后边需要接两个参数，用前边的for循环会有些问题。于是我换成了shell脚本，及require4.sh

#!/bin/bashdocker tag registry.aliyuncs.com/google_containers/kube-apiserver:v1.15.3 k8s.gcr.io/kube-apiserver:v1.15.3docker tag registry.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3 k8s.gcr.io/kube-controller-manager:v1.15.3docker tag registry.aliyuncs.com/google_containers/kube-scheduler:v1.15.3 k8s.gcr.io/kube-scheduler:v1.15.3docker tag registry.aliyuncs.com/google_containers/kube-proxy:v1.15.3 k8s.gcr.io/kube-proxy:v1.15.3docker tag registry.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1docker tag registry.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10docker tag registry.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1

执行脚本：#sh require4.sh 

[root@master ~]# sh require4.sh

[root@master ~]# docker images REPOSITORY                                                        TAG                 IMAGE ID            CREATED             SIZE k8s.gcr.io/kube-proxy                                             v1.15.3             232b5c793146        3 weeks ago         82.4 MB registry.aliyuncs.com/google_containers/kube-proxy                v1.15.3             232b5c793146        3 weeks ago         82.4 MB k8s.gcr.io/kube-apiserver                                         v1.15.3             5eb2d3fc7a44        3 weeks ago         207 MB registry.aliyuncs.com/google_containers/kube-apiserver            v1.15.3             5eb2d3fc7a44        3 weeks ago         207 MB registry.aliyuncs.com/google_containers/kube-scheduler            v1.15.3             703f9c69a5d5        3 weeks ago         81.1 MB k8s.gcr.io/kube-scheduler                                         v1.15.3             703f9c69a5d5        3 weeks ago         81.1 MB k8s.gcr.io/kube-controller-manager                                v1.15.3             e77c31de5547        3 weeks ago         159 MB registry.aliyuncs.com/google_containers/kube-controller-manager   v1.15.3             e77c31de5547        3 weeks ago         159 MB k8s.gcr.io/coredns                                                1.3.1               eb516548c180        8 months ago        40.3 MB registry.aliyuncs.com/google_containers/coredns                   1.3.1               eb516548c180        8 months ago        40.3 MB k8s.gcr.io/etcd                                                   3.3.10              2c4adeb21b4f        9 months ago        258 MB registry.aliyuncs.com/google_containers/etcd                      3.3.10              2c4adeb21b4f        9 months ago        258 MB k8s.gcr.io/pause                                                  3.1                 da86e6ba6ca1        21 months ago       742 kB registry.aliyuncs.com/google_containers/pause                     3.1                 da86e6ba6ca1        21 months ago       742 kB  

4、删除多余的镜像

[root@master ~]# vim require2.sh

registry.aliyuncs.com/google_containers/kube-apiserver:v1.15.3registry.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3registry.aliyuncs.com/google_containers/kube-scheduler:v1.15.3registry.aliyuncs.com/google_containers/kube-proxy:v1.15.3registry.aliyuncs.com/google_containers/pause:3.1registry.aliyuncs.com/google_containers/etcd:3.3.10registry.aliyuncs.com/google_containers/coredns:1.3.1

[root@master ~]# for i in `cat require2.sh`;do docker rmi $i;done Untagged: registry.aliyuncs.com/google_containers/kube-apiserver:v1.15.3 Untagged: registry.aliyuncs.com/google_containers/kube-apiserver@sha256:a21bcbcd23f7dbc6a331583645b56e639ec256cc6e2283a647ddd86505a4783e Untagged: registry.aliyuncs.com/google_containers/kube-controller-manager:v1.15.3 Untagged: registry.aliyuncs.com/google_containers/kube-controller-manager@sha256:f84c849e3c2105136b210d31018e3050744817a993d3c7b9f5ce3a03b0d82ff5 Untagged: registry.aliyuncs.com/google_containers/kube-scheduler:v1.15.3 Untagged: registry.aliyuncs.com/google_containers/kube-scheduler@sha256:77a630518b31525d85e9de3b4946eb0a54c9df56960a4056925ac14bb1d12a97 Untagged: registry.aliyuncs.com/google_containers/kube-proxy:v1.15.3 Untagged: registry.aliyuncs.com/google_containers/kube-proxy@sha256:fbeb72931327b1d66b6d481bc0e0a8c531a055432fc01ef28012d5746ad07877 Untagged: registry.aliyuncs.com/google_containers/pause:3.1 Untagged: registry.aliyuncs.com/google_containers/pause@sha256:759c3f0f6493093a9043cc813092290af69029699ade0e3dbe024e968fcb7cca Untagged: registry.aliyuncs.com/google_containers/etcd:3.3.10 Untagged: registry.aliyuncs.com/google_containers/etcd@sha256:240bd81c2f54873804363665c5d1a9b8e06ec5c63cfc181e026ddec1d81585bb Untagged: registry.aliyuncs.com/google_containers/coredns:1.3.1 Untagged: registry.aliyuncs.com/google_containers/coredns@sha256:638adb0319813f2479ba3642bbe37136db8cf363b48fb3eb7dc8db634d8d5a5b [root@master ~]# docker images REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE k8s.gcr.io/kube-proxy                v1.15.3             232b5c793146        3 weeks ago         82.4 MB k8s.gcr.io/kube-apiserver            v1.15.3             5eb2d3fc7a44        3 weeks ago         207 MB k8s.gcr.io/kube-scheduler            v1.15.3             703f9c69a5d5        3 weeks ago         81.1 MB k8s.gcr.io/kube-controller-manager   v1.15.3             e77c31de5547        3 weeks ago         159 MB k8s.gcr.io/coredns                   1.3.1               eb516548c180        8 months ago        40.3 MB k8s.gcr.io/etcd                      3.3.10              2c4adeb21b4f        9 months ago        258 MB k8s.gcr.io/pause                     3.1                 da86e6ba6ca1        21 months ago       742 kB5、到此，前边最开始提示的镜像全部准备好了，接下来就回到最开始的命令吧。

[root@master ~]# kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=NumCPU

W0915 05:04:14.258964    6290 version.go:98] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) W0915 05:04:14.259024    6290 version.go:99] falling back to the local client version: v1.15.3 [init] Using Kubernetes version: v1.15.3 [preflight] Running pre-flight checks [preflight] Pulling images required for setting up a Kubernetes cluster [preflight] This might take a minute or two, depending on the speed of your internet connection [preflight] You can also perform this action in beforehand using 'kubeadm config images pull' [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Activating the kubelet service [certs] Using certificateDir folder "/etc/kubernetes/pki" [certs] Generating "ca" certificate and key [certs] Generating "apiserver-kubelet-client" certificate and key [certs] Generating "apiserver" certificate and key [certs] apiserver serving cert is signed for DNS names [master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.150.20] [certs] Generating "front-proxy-ca" certificate and key [certs] Generating "front-proxy-client" certificate and key [certs] Generating "etcd/ca" certificate and key [certs] Generating "etcd/healthcheck-client" certificate and key [certs] Generating "apiserver-etcd-client" certificate and key [certs] Generating "etcd/server" certificate and key [certs] etcd/server serving cert is signed for DNS names [master localhost] and IPs [192.168.150.20 127.0.0.1 ::1] [certs] Generating "etcd/peer" certificate and key [certs] etcd/peer serving cert is signed for DNS names [master localhost] and IPs [192.168.150.20 127.0.0.1 ::1] [certs] Generating "sa" key and public key [kubeconfig] Using kubeconfig folder "/etc/kubernetes" [kubeconfig] Writing "admin.conf" kubeconfig file [kubeconfig] Writing "kubelet.conf" kubeconfig file [kubeconfig] Writing "controller-manager.conf" kubeconfig file [kubeconfig] Writing "scheduler.conf" kubeconfig file [control-plane] Using manifest folder "/etc/kubernetes/manifests" [control-plane] Creating static Pod manifest for "kube-apiserver" [control-plane] Creating static Pod manifest for "kube-controller-manager" [control-plane] Creating static Pod manifest for "kube-scheduler" [etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests" [wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s [apiclient] All control plane components are healthy after 37.502121 seconds [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace [kubelet] Creating a ConfigMap "kubelet-config-1.15" in namespace kube-system with the configuration for the kubelets in the cluster [upload-certs] Skipping phase. Please see --upload-certs [mark-control-plane] Marking the node master as control-plane by adding the label "node-role.kubernetes.io/master=''" [mark-control-plane] Marking the node master as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule] [bootstrap-token] Using token: v0c13b.foa68xh8qjtbygyt [bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles [bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials [bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token [bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster [bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace [addons] Applied essential addon: CoreDNS [addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube

  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config   sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.

Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:   https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.150.20:6443 --token v0c13b.foa68xh8qjtbygyt \

    --discovery-token-ca-cert-hash sha256:4521a13c88cc80a662361163d506c9d91f5fa8303106c82baff439f80c6c3f4a 上面的生成的token需要保存一下。

至此，kubernetes的踩坑告一段落，接下来有啥新问题我会继续在博客上面记录下来。

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