{"id":231,"date":"2018-12-08T01:54:47","date_gmt":"2018-12-08T01:54:47","guid":{"rendered":"http:\/\/cephswift.com\/?page_id=231"},"modified":"2019-07-26T17:32:18","modified_gmt":"2019-07-26T17:32:18","slug":"setup_centos_kubernetes_docker_cluster_tutorial","status":"publish","type":"page","link":"https:\/\/cephswift.com\/index.php\/setup_centos_kubernetes_docker_cluster_tutorial\/","title":{"rendered":"setup_centos_kubernetes_docker_cluster_tutorial"},"content":{"rendered":"

Pre-Steps,\u00a0 install 3 – 5 VM or physical nodes with Centos7.X,\u00a0 make \/etc\/hosts file on each of them !<\/strong><\/p>\n

Step1:\u00a0 Run my setup below to config systems, setup docker and kubernetes repository, then install on each k8 notes:<\/strong><\/p>\n

# cat\u00a0install_docker_k8.sh<\/strong>
\n#! \/usr\/bin\/bash
\n#
\n# Disable SELinux
\nsetenforce 0
\nsed -i –follow-symlinks ‘s\/SELINUX=enforcing\/SELINUX=disabled\/g’ \/etc\/sysconfig\/selinux<\/p>\n

# Enable br_netfilter_kernel_module
\nmodprobe br_netfilter
\necho ‘1’ > \/proc\/sys\/net\/bridge\/bridge-nf-call-iptables<\/p>\n

# Disable SWAP
\nswapoff -a
\ncp \/etc\/fstab \/etc\/fstab.orig.BK ### backup this file before change
\nsed -i ‘s\/^\\\/dev\\\/mapper\\\/centos-swap\/#\\\/dev\\\/mapper\\\/centos-swap\/g’ \/etc\/fstab
\ncat \/etc\/fstab ### verify if the swap line get comment out
\nsleep 15<\/p>\n

# update systeam and install Docker-CE from docker repository
\nyum update -y
\nyum install -y yum-utils device-mapper-persistent-data lvm2
\nyum-config-manager –add-repo https:\/\/download.docker.com\/linux\/centos\/docker-ce.repo
\nyum install -y docker-ce<\/p>\n

# setup kubernetes repository and install k8
\ncat <<EOF > \/etc\/yum.repos.d\/kubernetes.repo
\n[kubernetes]
\nname=Kubernetes
\nbaseurl=https:\/\/packages.cloud.google.com\/yum\/repos\/kubernetes-el7-x86_64
\nenabled=1
\ngpgcheck=1
\nrepo_gpgcheck=1
\ngpgkey=https:\/\/packages.cloud.google.com\/yum\/doc\/yum-key.gpg
\nhttps:\/\/packages.cloud.google.com\/yum\/doc\/rpm-package-key.gpg
\nEOF<\/p>\n

#cat \/etc\/yum.repos.d\/kubernetes.repo ## this line is to verify the repo contains
\nyum install -y kubelet kubeadm kubectl<\/p>\n

# .\/install_docker_k8.sh<\/strong><\/p>\n

# Step2:\u00a0 \u00a0reboot each node after install<\/strong><\/p>\n

# Step3:\u00a0 \u00a0Start docker and kubernetes services on each node:<\/strong><\/p>\n

# cat start_docker_k8_service.sh
\nsystemctl start docker && systemctl enable docker
\nsystemctl start kubelet && systemctl enable kubelet<\/p>\n

systemctl status docker
\nsystemctl status kubelet<\/p>\n

# .\/start_docker_k8_service.sh<\/p>\n

# The process above will give output as below:<\/p>\n

Created symlink from \/etc\/systemd\/system\/multi-user.target.wants\/docker.service to \/usr\/lib\/systemd\/system\/docker.service.
\nCreated symlink from \/etc\/systemd\/system\/multi-user.target.wants\/kubelet.service to \/etc\/systemd\/system\/kubelet.service.
\n\u25cf docker.service – Docker Application Container Engine
\nLoaded: loaded (\/usr\/lib\/systemd\/system\/docker.service; enabled; vendor preset: disabled)
\nActive: active (running) since Fri 2018-12-07 20:26:32 EST; 121ms ago
\nDocs: https:\/\/docs.docker.com
\nMain PID: 3824 (dockerd)
\nCGroup: \/system.slice\/docker.service
\n\u251c\u25003824 \/usr\/bin\/dockerd -H unix:\/\/
\n\u2514\u25003847 containerd –config \/var\/run\/docker\/containerd\/containerd.toml –log-level info<\/p>\n

……<\/p>\n

Hint: Some lines were ellipsized, use -l to show in full.
\n\u25cf kubelet.service – kubelet: The Kubernetes Node Agent
\nLoaded: loaded (\/etc\/systemd\/system\/kubelet.service; enabled; vendor preset: disabled)
\nDrop-In: \/etc\/systemd\/system\/kubelet.service.d
\n\u2514\u250010-kubeadm.conf
\nActive: active (running) since Fri 2018-12-07 20:26:32 EST; 76ms ago
\nDocs: https:\/\/kubernetes.io\/docs\/
\nMain PID: 4018 (kubelet)
\nCGroup: \/system.slice\/kubelet.service
\n\u2514\u25004018 \/usr\/bin\/kubelet –bootstrap-kubeconfig=\/etc\/kubernetes\/bootstrap-kubelet.conf –kubeconfig=\/etc\/kubernetes\/kubelet.conf –config=\/va…<\/p>\n

Dec 07 20:26:32 centos_k8_node4 systemd[1]: Started kubelet: The Kubernetes Node Agent.<\/p>\n

# Step 4,\u00a0 Change the cgroup-driver<\/strong><\/p>\n

docker info | grep -i cgroup<\/code><\/pre>\n
sed -i 's\/cgroup-driver=systemd\/cgroup-driver=cgroupfs\/g' \/etc\/systemd\/system\/kubelet.service.d\/10-kubeadm.conf\r\n\r\n<\/code><\/pre>\n
[root@centos_k8_master ~]# docker info | grep -i cgroup
\nWARNING: bridge-nf-call-iptables is disabled
\nWARNING: bridge-nf-call-ip6tables is disabled
\nCgroup Driver: cgroupfs
\n[root@centos_k8_master ~]# sed -i ‘s\/cgroup-driver=systemd\/cgroup-driver=cgroupfs\/g’ \/etc\/systemd\/system\/kubelet.service.d\/10-kubeadm.conf
\n[root@centos_k8_master ~]# docker info | grep -i cgroup
\nWARNING: bridge-nf-call-iptables is disabled
\nWARNING: bridge-nf-call-ip6tables is disabled
\nCgroup Driver: cgroupfs
\n[root@centos_k8_master ~]# systemctl daemon-reload
\n[root@centos_k8_master ~]# systemctl restart kubelet
\n[root@centos_k8_master ~]# systemctl status kubelet
\n\u25cf kubelet.service – kubelet: The Kubernetes Node Agent
\nLoaded: loaded (\/etc\/systemd\/system\/kubelet.service; enabled; vendor preset: disabled)
\nDrop-In: \/etc\/systemd\/system\/kubelet.service.d
\n\u2514\u250010-kubeadm.conf
\nActive: activating (auto-restart) (Result: exit-code) since Fri 2018-12-07 20:37:30 EST; 8s ago
\nDocs: https:\/\/kubernetes.io\/docs\/
\nProcess: 4889 ExecStart=\/usr\/bin\/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=255)
\nMain PID: 4889 (code=exited, status=255)<\/p>\n
Dec 07 20:37:30 centos_k8_master systemd[1]: Unit kubelet.service entered failed state.
\nDec 07 20:37:30 centos_k8_master systemd[1]: kubelet.service failed.<\/p>\n
[root@centos_k8_master ~]# docker info | grep -i cgroup
\nCgroup Driver: cgroupfs
\nWARNING: bridge-nf-call-iptables is disabled
\nWARNING: bridge-nf-call-ip6tables is disabl<\/p>\n
Step 5:\u00a0 Kubernetes Cluster Initialization<\/strong><\/p>\n
# cat config_k8_master.sh
\n# setup firewall to allow k8 process
\nfirewall-cmd –zone=public –permanent –add-port=6443\/tcp
\nfirewall-cmd –zone=public –permanent –add-port=10250\/tcp
\nfirewall-cmd –zone=public –permanent –add-port=6443\/udp
\nfirewall-cmd –zone=public –permanent –add-port=10250\/udp
\nfirewall-cmd –zone=public –permanent –list-ports
\nfirewall-cmd –reload
\nfirewall-cmd –get-services<\/p>\n
## setup k8 iptables to allow net.bridge traffic
\ncat <<EOF > \/etc\/sysctl.d\/k8s.conf
\nnet.bridge.bridge-nf-call-ip6tables = 1
\nnet.bridge.bridge-nf-call-iptables = 1
\nEOF<\/p>\n
# create k8 cluster from “kubeadm init”
\necho “kubeadm init” > k8_init.log
\n#kubeadm init | tee -a k8_init.log
\nkubeadm init –apiserver-advertise-address=192.168.57.59 –pod-network-cidr=10.244.0.0\/16 | tee -a k8_init.log<\/p>\n
# deploy the flannel network to the kubernetes cluster using the kubectl command
\nmkdir -p $HOME\/.kube
\nsudo cp -i \/etc\/kubernetes\/admin.conf $HOME\/.kube\/config
\nsudo chown $(id -u):$(id -g) $HOME\/.kube\/config
\nkubectl apply -f https:\/\/raw.githubusercontent.com\/coreos\/flannel\/master\/Documentation\/kube-flannel.yml<\/p>\n
# run the script above:<\/p>\n
# .\/config_k8_master.sh<\/p>\n
[root@centos-k8-node4 ~]# cat k8_init.log
\nkubeadm init
\n[init] Using Kubernetes version: v1.13.1
\n[preflight] Running pre-flight checks
\n[preflight] Pulling images required for setting up a Kubernetes cluster
\n[preflight] This might take a minute or two, depending on the speed of your internet connection
\n[preflight] You can also perform this action in beforehand using ‘kubeadm config images pull’
\n[kubelet-start] Writing kubelet environment file with flags to file “\/var\/lib\/kubelet\/kubeadm-flags.env”
\n[kubelet-start] Writing kubelet configuration to file “\/var\/lib\/kubelet\/config.yaml”
\n[kubelet-start] Activating the kubelet service
\n[certs] Using certificateDir folder “\/etc\/kubernetes\/pki”
\n[certs] Generating “etcd\/ca” certificate and key
\n[certs] Generating “etcd\/healthcheck-client” certificate and key
\n[certs] Generating “apiserver-etcd-client” certificate and key
\n[certs] Generating “etcd\/server” certificate and key
\n[certs] etcd\/server serving cert is signed for DNS names [centos-k8-node4 localhost] and IPs [192.168.57.59 127.0.0.1 ::1]
\n[certs] Generating “etcd\/peer” certificate and key
\n[certs] etcd\/peer serving cert is signed for DNS names [centos-k8-node4 localhost] and IPs [192.168.57.59 127.0.0.1 ::1]
\n[certs] Generating “ca” certificate and key
\n[certs] Generating “apiserver” certificate and key
\n[certs] apiserver serving cert is signed for DNS names [centos-k8-node4 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.57.59]
\n[certs] Generating “apiserver-kubelet-client” certificate and key
\n[certs] Generating “front-proxy-ca” certificate and key
\n[certs] Generating “front-proxy-client” certificate and key
\n[certs] Generating “sa” key and public key
\n[kubeconfig] Using kubeconfig folder “\/etc\/kubernetes”
\n[kubeconfig] Writing “admin.conf” kubeconfig file
\n[kubeconfig] Writing “kubelet.conf” kubeconfig file
\n[kubeconfig] Writing “controller-manager.conf” kubeconfig file
\n[kubeconfig] Writing “scheduler.conf” kubeconfig file
\n[control-plane] Using manifest folder “\/etc\/kubernetes\/manifests”
\n[control-plane] Creating static Pod manifest for “kube-apiserver”
\n[control-plane] Creating static Pod manifest for “kube-controller-manager”
\n[control-plane] Creating static Pod manifest for “kube-scheduler”
\n[etcd] Creating static Pod manifest for local etcd in “\/etc\/kubernetes\/manifests”
\n[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
\n[apiclient] All control plane components are healthy after 17.506171 seconds
\n[uploadconfig] storing the configuration used in ConfigMap “kubeadm-config” in the “kube-system” Namespace
\n[kubelet] Creating a ConfigMap “kubelet-config-1.13” in namespace kube-system with the configuration for the kubelets in the cluster
\n[patchnode] Uploading the CRI Socket information “\/var\/run\/dockershim.sock” to the Node API object “centos-k8-node4” as an annotation
\n[mark-control-plane] Marking the node centos-k8-node4 as control-plane by adding the label “node-role.kubernetes.io\/master=””
\n[mark-control-plane] Marking the node centos-k8-node4 as control-plane by adding the taints [node-role.kubernetes.io\/master:NoSchedule]
\n[bootstrap-token] Using token: 94q0sq.1erns4x5ail242dv
\n[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
\n[bootstraptoken] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
\n[bootstraptoken] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
\n[bootstraptoken] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
\n[bootstraptoken] creating the “cluster-info” ConfigMap in the “kube-public” namespace
\n[addons] Applied essential addon: CoreDNS
\n[addons] Applied essential addon: kube-proxy<\/p>\n
Your Kubernetes master has initialized successfully!<\/p>\n
To start using your cluster, you need to run the following as a regular user:<\/p>\n
mkdir -p $HOME\/.kube
\nsudo cp -i \/etc\/kubernetes\/admin.conf $HOME\/.kube\/config
\nsudo chown $(id -u):$(id -g) $HOME\/.kube\/config<\/p>\n
You should now deploy a pod network to the cluster.
\nRun “kubectl apply -f [podnetwork].yaml” with one of the options listed at:
\nhttps:\/\/kubernetes.io\/docs\/concepts\/cluster-administration\/addons\/<\/p>\n
You can now join any number of machines by running the following on each node
\nas root:<\/p>\n
kubeadm join 192.168.57.59:6443 –token 94q0sq.1erns4x5ail242dv –discovery-token-ca-cert-hash sha256:8ab6c17b87d60e4fc5eaad8739e557c4788ab8e753b79ccc47bfb2ab5ed61dc6<\/p>\n
root@centos-k8-node4 ~]# mkdir -p $HOME\/.kube<\/b><\/span><\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# sudo cp -i \/etc\/kubernetes\/admin.conf $HOME\/.kube\/config<\/b><\/span><\/span><\/span><\/span><\/p>\n
cp: overwrite \u2018\/root\/.kube\/config\u2019? y<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# sudo chown $(id -u):$(id -g) $HOME\/.kube\/config<\/b><\/span><\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl apply -f https:\/\/raw.githubusercontent.com\/coreos\/flannel\/master\/Documentation\/kube-flannel.yml<\/b><\/span><\/span><\/span><\/span><\/p>\n
clusterrole.rbac.authorization.k8s.io\/flannel created<\/span><\/span><\/span><\/p>\n
clusterrolebinding.rbac.authorization.k8s.io\/flannel created<\/span><\/span><\/span><\/p>\n
serviceaccount\/flannel created<\/span><\/span><\/span><\/p>\n
configmap\/kube-flannel-cfg created<\/span><\/span><\/span><\/p>\n
daemonset.extensions\/kube-flannel-ds-amd64 created<\/span><\/span><\/span><\/p>\n
daemonset.extensions\/kube-flannel-ds-arm64 created<\/span><\/span><\/span><\/p>\n
daemonset.extensions\/kube-flannel-ds-arm created<\/span><\/span><\/span><\/p>\n
daemonset.extensions\/kube-flannel-ds-ppc64le created<\/span><\/span><\/span><\/p>\n
daemonset.extensions\/kube-flannel-ds-s390x created<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# systemctl restart docker<\/b><\/span><\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# systemctl restart kubelet<\/b><\/span><\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# systemctl status docker kubelet<\/b><\/span><\/span><\/span><\/span><\/p>\n
root@centos-k8-node4 ~]# kubectl get nodes<\/b><\/span><\/span><\/span><\/span><\/p>\n
NAME STATUS ROLES AGE VERSION<\/span><\/span><\/span><\/p>\n
centos-k8-node4 Ready master 12m v1.13.0<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl get pods –all-namespaces<\/b><\/span><\/span><\/span><\/span><\/p>\n
NAMESPACE NAME READY STATUS RESTARTS AGE<\/span><\/span><\/span><\/p>\n
kube-system coredns-86c58d9df4-4nkc6 1\/1 Running 1 12m<\/span><\/span><\/span><\/p>\n
kube-system coredns-86c58d9df4-q8bdp 1\/1 Running 1 12m<\/span><\/span><\/span><\/p>\n
kube-system etcd-centos-k8-node4 1\/1 Running 1 12m<\/span><\/span><\/span><\/p>\n
kube-system kube-apiserver-centos-k8-node4 1\/1 Running 1 11m<\/span><\/span><\/span><\/p>\n
kube-system kube-controller-manager-centos-k8-node4 1\/1 Running 2 11m<\/span><\/span><\/span><\/p>\n
kube-system kube-flannel-ds-amd64-fb427 1\/1 Running 2 12m<\/span><\/span><\/span><\/p>\n
kube-system kube-proxy-8pct6 1\/1 Running 2 12m<\/span><\/span><\/span><\/p>\n
kube-system kube-scheduler-centos-k8-node4 1\/1 Running 1 11m<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
# add 2 more node to the cluster and verify:<\/b><\/span><\/span><\/span><\/p>\n
# cat config_k8_slave.sh\u00a0 ## run this script from k8 slave node<\/span><\/span><\/span><\/p>\n
cat\u00a0config_k8_slave.sh
\n# setup firewall to allow k8 process
\nfirewall-cmd –zone=public –permanent –add-port=6443\/tcp
\nfirewall-cmd –zone=public –permanent –add-port=10250\/tcp
\nfirewall-cmd –zone=public –permanent –add-port=6443\/udp
\nfirewall-cmd –zone=public –permanent –add-port=10250\/udp
\nfirewall-cmd –zone=public –permanent –list-ports
\nfirewall-cmd –reload
\nfirewall-cmd –get-services<\/p>\n
# setup k8 iptables to allow net.bridge traffic
\ncat <<EOF > \/etc\/sysctl.d\/k8s.conf
\nnet.bridge.bridge-nf-call-ip6tables = 1
\nnet.bridge.bridge-nf-call-iptables = 1
\nEOF<\/p>\n
echo “1” > \/proc\/sys\/net\/bridge\/bridge-nf-call-iptables<\/p>\n
run above script on each slave node:<\/h2>\n
.\/config_k8_slave.sh<\/p>\n
Then add each slave node to master with command:<\/p>\n
kubeadm join 192.168.57.59:6443 –token 94q0sq.1erns4x5ail242dv –discovery-token-ca-cert-hash sha256:8ab6c17b87d60e4fc5eaad8739e557c4788ab8e753b79ccc47bfb2ab5ed61dc6<\/p>\n
## verify<\/p>\n
[root@centos-k8-node4 ~]# kubectl get nodes<\/b><\/span><\/span><\/span><\/span><\/p>\n
NAME STATUS ROLES AGE VERSION<\/span><\/span><\/span><\/p>\n
centos-k8-node4 Ready master 47m v1.13.0<\/span><\/span><\/span><\/p>\n
centos-k8-node5 Ready <none> 4m41s v1.13.0<\/span><\/span><\/span><\/p>\n
centos-k8-node6 Ready <none> 27s v1.13.0<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl get pods –all-namespaces<\/b><\/span><\/span><\/span><\/span><\/p>\n
NAMESPACE NAME READY STATUS RESTARTS AGE<\/span><\/span><\/span><\/p>\n
kube-system coredns-86c58d9df4-4nkc6 1\/1 Running 1 47m<\/span><\/span><\/span><\/p>\n
kube-system coredns-86c58d9df4-q8bdp 1\/1 Running 1 47m<\/span><\/span><\/span><\/p>\n
kube-system etcd-centos-k8-node4 1\/1 Running 1 46m<\/span><\/span><\/span><\/p>\n
kube-system kube-apiserver-centos-k8-node4 1\/1 Running 1 46m<\/span><\/span><\/span><\/p>\n
kube-system kube-controller-manager-centos-k8-node4 1\/1 Running 2 46m<\/span><\/span><\/span><\/p>\n
kube-system kube-flannel-ds-amd64-4w6kh 1\/1 Running 0 5m30s<\/span><\/span><\/span><\/p>\n
kube-system kube-flannel-ds-amd64-fb427 1\/1 Running 2 46m<\/span><\/span><\/span><\/p>\n
kube-system kube-flannel-ds-amd64-tp6df 1\/1 Running 0 76s<\/span><\/span><\/span><\/p>\n
kube-system kube-proxy-8pct6 1\/1 Running 2 47m<\/span><\/span><\/span><\/p>\n
kube-system kube-proxy-djqp5 config_k8_slave.sh 1\/1 Running 0 76s<\/span><\/span><\/span><\/p>\n
kube-system kube-proxy-v4rwl 1\/1 Running 0 5m30s<\/span><\/span><\/span><\/p>\n
kube-system kube-scheduler-centos-k8-node4 1\/1 Running 1 46m<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl create deployment nginx –image=nginx<\/b><\/span><\/span><\/span><\/span><\/p>\n
deployment.apps\/nginx created<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl describe deployment nginx<\/b><\/span><\/span><\/span><\/span><\/p>\n
Name: nginx<\/span><\/span><\/span><\/p>\n
Namespace: default<\/span><\/span><\/span><\/p>\n
CreationTimestamp: Fri, 14 Dec 2018 18:20:18 -0500<\/span><\/span><\/span><\/p>\n
Labels: app=nginx<\/span><\/span><\/span><\/p>\n
Annotations: deployment.kubernetes.io\/revision: 1<\/span><\/span><\/span><\/p>\n
Selector: app=nginx<\/span><\/span><\/span><\/p>\n
Replicas: 1 desired | 1 updated | 1 total | 1 available | 0 unavailable<\/span><\/span><\/span><\/p>\n
StrategyType: RollingUpdate<\/span><\/span><\/span><\/p>\n
MinReadySeconds: 0<\/span><\/span><\/span><\/p>\n
RollingUpdateStrategy: 25% max unavailable, 25% max surge<\/span><\/span><\/span><\/p>\n
Pod Template:<\/span><\/span><\/span><\/p>\n
 Labels: app=nginx<\/span><\/span><\/span><\/p>\n
 Containers:<\/span><\/span><\/span><\/p>\n
 nginx:<\/span><\/span><\/span><\/p>\n
 Image: nginx<\/span><\/span><\/span><\/p>\n
 Port: <none><\/span><\/span><\/span><\/p>\n
 Host Port: <none><\/span><\/span><\/span><\/p>\n
 Environment: <none><\/span><\/span><\/span><\/p>\n
 Mounts: <none><\/span><\/span><\/span><\/p>\n
 Volumes: <none><\/span><\/span><\/span><\/p>\n
Conditions:<\/span><\/span><\/span><\/p>\n
 Type Status Reason<\/span><\/span><\/span><\/p>\n
 —- —— ——<\/span><\/span><\/span><\/p>\n
 Available True MinimumReplicasAvailable<\/span><\/span><\/span><\/p>\n
 Progressing True NewReplicaSetAvailable<\/span><\/span><\/span><\/p>\n
OldReplicaSets: <none><\/span><\/span><\/span><\/p>\n
NewReplicaSet: nginx-5c7588df (1\/1 replicas created)<\/span><\/span><\/span><\/p>\n
Events:<\/span><\/span><\/span><\/p>\n
 Type Reason Age From Message<\/span><\/span><\/span><\/p>\n
 —- —— —- —- ——-<\/span><\/span><\/span><\/p>\n
 Normal ScalingReplicaSet 15s deployment-controller Scaled up replica set nginx-5c7588df to 1<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl create service nodeport nginx –tcp=80:80<\/b><\/span><\/span><\/span><\/span><\/p>\n
service\/nginx created<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl get nodes<\/b><\/span><\/span><\/span><\/span><\/p>\n
NAME STATUS ROLES AGE VERSION<\/span><\/span><\/span><\/p>\n
centos-k8-node4 Ready master 50m v1.13.0<\/span><\/span><\/span><\/p>\n
centos-k8-node5 Ready <none> 7m38s v1.13.0<\/span><\/span><\/span><\/p>\n
centos-k8-node6 Ready <none> 3m24s v1.13.0<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# kubectl get svc<\/b><\/span><\/span><\/span><\/span><\/p>\n
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE<\/span><\/span><\/span><\/p>\n
kubernetes ClusterIP 10.96.0.1 <none> 443\/TCP 50m<\/span><\/span><\/span><\/p>\n
nginx NodePort 10.109.14.203 <none> 80:32543\/TCP 44s<\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# curl centos-k8-node6:32543<\/b><\/span><\/span><\/span><\/span><\/p>\n
<!DOCTYPE html><\/span><\/span><\/span><\/p>\n
<html><\/span><\/span><\/span><\/p>\n
<head><\/span><\/span><\/span><\/p>\n
<title>Welcome to nginx!<\/title><\/span><\/span><\/span><\/p>\n
<style><\/span><\/span><\/span><\/p>\n
 body {<\/span><\/span><\/span><\/p>\n
 width: 35em;<\/span><\/span><\/span><\/p>\n
 margin: 0 auto;<\/span><\/span><\/span><\/p>\n
 font-family: Tahoma, Verdana, Arial, sans-serif;<\/span><\/span><\/span><\/p>\n
 }<\/span><\/span><\/span><\/p>\n
<\/style><\/span><\/span><\/span><\/p>\n
<\/head><\/span><\/span><\/span><\/p>\n
<body><\/span><\/span><\/span><\/p>\n
<h1>Welcome to nginx!<\/h1><\/span><\/span><\/span><\/p>\n
<p>If you see this page, the nginx web server is successfully installed and<\/span><\/span><\/span><\/p>\n
working. Further configuration is required.<\/p><\/span><\/span><\/span><\/p>\n
<p>For online documentation and support please refer to<\/span><\/span><\/span><\/p>\n
<a href=”http:\/\/nginx.org\/”>nginx.org<\/a>.<br\/><\/span><\/span><\/span><\/p>\n
Commercial support is available at<\/span><\/span><\/span><\/p>\n
<a href=”http:\/\/nginx.com\/”>nginx.com<\/a>.<\/p><\/span><\/span><\/span><\/p>\n
<p><em>Thank you for using nginx.<\/em><\/p><\/span><\/span><\/span><\/p>\n
<\/body><\/span><\/span><\/span><\/p>\n
<\/html><\/span><\/span><\/span><\/p>\n
[root@centos-k8-node4 ~]# <\/span><\/span><\/span><\/p>\n
 <\/p>\n
refer:<\/p>\n
https:\/\/www.howtoforge.com\/tutorial\/centos-kubernetes-docker-cluster\/<\/p>\n
<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
Pre-Steps,\u00a0 install 3 – 5 VM or physical nodes with Centos7.X,\u00a0 make \/etc\/hosts file on each of them ! Step1:\u00a0 Run my setup below to config systems, setup docker and kubernetes repository, then install on each k8 notes: # cat\u00a0install_docker_k8.sh #! \/usr\/bin\/bash # # Disable SELinux setenforce 0 sed -i –follow-symlinks ‘s\/SELINUX=enforcing\/SELINUX=disabled\/g’ \/etc\/sysconfig\/selinux # Enable […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/pages\/231"}],"collection":[{"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/comments?post=231"}],"version-history":[{"count":4,"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/pages\/231\/revisions"}],"predecessor-version":[{"id":235,"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/pages\/231\/revisions\/235"}],"wp:attachment":[{"href":"https:\/\/cephswift.com\/index.php\/wp-json\/wp\/v2\/media?parent=231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}