k8s的LInux单节点部署(含containerCreating、ImagePullBackOff、CrashLoopBackOff问题的解决方案)
1、安装etcd和kubernetes该步骤会默认安装docker。所以建议在原机器上没有安装Docker,否则可能会有冲突导致安装失败。yum install -y etcd kubernetes2、配置(1)、修改配置文件:/etc/sysconfig/docker添加下面一行,使用内网仓库:ADD_REGISTRY='--add-registry reg.docker.lc'(2)修改配置文
1、安装etcd和kubernetes
该步骤会默认安装docker。所以建议在原机器上没有安装Docker,否则可能会有冲突导致安装失败。
yum install -y etcd kubernetes
2、配置
(1)、修改配置文件:/etc/sysconfig/docker(可不必操作,因为后面使用的仓库是daocloude镜像地址:https://dashboard.daocloud.io/packages)
添加下面一行,使用内网仓库:
ADD_REGISTRY='--add-registry reg.docker.lc'
(2)修改配置文件:/etc/kubernetes/apiserver
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0" #这里把127.0.0.1改成0.0.0.0
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,Security ContextDeny,ResourceQuota"
#这里把ServiceAccount去掉
3、查看docker版本
上面命令并没有加入docker,但它却自动安装了
docker version
4、启动服务
把服务添加到启动项,并启动服务:
for SERVICE in docker etcd kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet; do
systemctl start $SERVICE
systemctl enable $SERVICE
# systemctl stop $SERVICE #关闭服务
done
5、查看相关情况
ps -ef | grep kube
出现以上结果,则说明安装成功
6、安装kubernetes-dashboard
(1)kubernetes-dashboard.yaml文件配置
源文件地址:https://github.com/kubernetes/dashboard/releases?after=v1.7.0
cat >kubernetes-dashboard.yaml<<-EOF
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
labels:
app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
replicas: 1
selector:
matchLabels:
app: kubernetes-dashboard
template:
metadata:
labels:
app: kubernetes-dashboard
# Comment the following annotation if Dashboard must not be deployed on master
annotations:
scheduler.alpha.kubernetes.io/tolerations: |
[
{
"key": "dedicated",
"operator": "Equal",
"value": "master",
"effect": "NoSchedule"
}
]
spec:
containers:
- name: kubernetes-dashboard
image: reg.docker.lc/share/kubernetes-dashboard-amd64:v1.5.1 #默认的镜像是使用google的,这里改成内网
imagePullPolicy: Always
ports:
- containerPort: 9090
protocol: TCP
args:
# Uncomment the following line to manually specify Kubernetes API server Host
# If not specified, Dashboard will attempt to auto discover the API server and connect
# to it. Uncomment only if the default does not work.
- --apiserver-host=http://10.0.10.10:8080 #注意这里是api的地址
livenessProbe:
httpGet:
path: /
port: 9090
initialDelaySeconds: 30
timeoutSeconds: 30
---
kind: Service
apiVersion: v1
metadata:
labels:
app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
type: NodePort
ports:
- port: 80
targetPort: 9090
selector:
app: kubernetes-dashboard
EOF
(2)安装
kubectl create -f kubernetes-dashboard.yaml
(3)查看
kubectl get pods --all-namespaces
7、使用
(1)查看网络端口使用情况
netstat -nultup
(2)浏览器访问
①api访问
http://ip:8080
②界面访问
http://ip:8080/api/v1/namespaces/kube-system/services/http:kubernetes-dashboard:/proxy/#/workload?namespace=default
8、问题解决
(1)containerCreating
FailedSynError syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)" 13m 11s 56 {kubelet 127.0.0.1} Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"registry.access.redhat.com/rhel7/pod-infrastructure:latest\""
Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)"
①查看pod
kubectl describe pod kubernetes-dashboard-3603079361-b2x00 --namespace=kube-system
②删除pod
kubectl get pod -n nameSpaceName
kubectl delete pod podName -n nameSpaceName
kubectl get deployment -n nameSpaceName
kubectl delete deployment deploymentName -n nameSpaceName
③添加证书
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm
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
(2)ImagePullBackOff
①问题阐述:
②添加可被成功拉取的镜像
daocloude镜像地址:https://dashboard.daocloud.io/packages
# Copyright 2015 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Configuration to deploy release version of the Dashboard UI.
#
# Example usage: kubectl create -f <this_file>
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
labels:
app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
replicas: 1
selector:
matchLabels:
app: kubernetes-dashboard
template:
metadata:
labels:
app: kubernetes-dashboard
# Comment the following annotation if Dashboard must not be deployed on master
annotations:
scheduler.alpha.kubernetes.io/tolerations: |
[
{
"key": "dedicated",
"operator": "Equal",
"value": "master",
"effect": "NoSchedule"
}
]
spec:
containers:
- name: kubernetes-dashboard
image: daocloud.io/gfkchinanetquest/kubernetes-dashboard-amd64:v1.5.1
imagePullPolicy: Always
ports:
- containerPort: 9090
protocol: TCP
args:
# Uncomment the following line to manually specify Kubernetes API server Host
# If not specified, Dashboard will attempt to auto discover the API server and connect
# to it. Uncomment only if the default does not work.
# - --apiserver-host=http://my-address:port
livenessProbe:
httpGet:
path: /
port: 9090
initialDelaySeconds: 30
timeoutSeconds: 30
---
kind: Service
apiVersion: v1
metadata:
labels:
app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
type: NodePort
ports:
- port: 80
targetPort: 9090
selector:
app: kubernetes-dashboard
(3)CrashLoopBackOff
服务无法启动,处于不断重启的过程中,但是无法成功开启
查看日志
kubectl logs kubernetes-dashboard-3933968709-9f7qn -n kube-system
网络端口使用情况
原因分析:apiserver的端口使用错误,在配置中若将“# - --apiserver-host”部分注释,则系统默认使用了无证书的6443,导致无法征程链接apiserver服务,因此要将注释去掉,修改成以下内容
- --apiserver-host=http://140.143.159.146:8080
140.143.159.146为你的云服务器IP地址,8080为含证书的dashboard的http访问端口,6443为https访问端口
附上最终的yaml文件
# Copyright 2015 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Configuration to deploy release version of the Dashboard UI.
#
# Example usage: kubectl create -f <this_file>
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
labels:
app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
replicas: 1
selector:
matchLabels:
app: kubernetes-dashboard
template:
metadata:
labels:
app: kubernetes-dashboard
# Comment the following annotation if Dashboard must not be deployed on master
annotations:
scheduler.alpha.kubernetes.io/tolerations: |
[
{
"key": "dedicated",
"operator": "Equal",
"value": "master",
"effect": "NoSchedule"
}
]
spec:
containers:
- name: kubernetes-dashboard
image: daocloud.io/gfkchinanetquest/kubernetes-dashboard-amd64:v1.5.1
imagePullPolicy: Always
ports:
- containerPort: 9090
protocol: TCP
args:
# Uncomment the following line to manually specify Kubernetes API server Host
# If not specified, Dashboard will attempt to auto discover the API server and connect
# to it. Uncomment only if the default does not work.
- --apiserver-host=http://140.111.123.252:8080 #将140.111.123.252更改为你的ip地址
livenessProbe:
httpGet:
path: /
port: 9090
initialDelaySeconds: 30
timeoutSeconds: 30
---
kind: Service
apiVersion: v1
metadata:
labels:
app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
type: NodePort
ports:
- port: 80
targetPort: 9090
selector:
app: kubernetes-dashboard
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