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kubernetes v1.11.1 - HA setup scripts for centos 7.x used (kickstart file used: https://gist.github.com/aleks-mariusz/f01f3177a13f1e86e4088e5b6c7f278d) - need to also set up keepalived on 2nd/3rd node and replace socat with nginx
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| #!/bin/sh | |
| INTERFACE=eth0 | |
| NETMASK_CIDR='/24' # 255.255.255.0 | |
| LOAD_BALANCER_IP=192.168.1.100 | |
| LOAD_BALANCER_DNS=api-k8s-lab | |
| LOAD_BALANCER_PORT=6443 | |
| CP_PORT=6443 | |
| CP0_HOSTNAME=k8s-lab1 | |
| CP0_IP=192.168.1.101 | |
| CP1_HOSTNAME=k8s-lab2 | |
| CP1_IP=192.168.1.102 | |
| CP2_HOSTNAME=k8s-lab3 | |
| CP2_IP=192.168.1.103 | |
| set -x | |
| cat <<EOF > /etc/yum.repos.d/kubernetes.repo | |
| [kubernetes] | |
| name=Kubernetes | |
| baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 | |
| enabled=1 | |
| gpgcheck=1 | |
| repo_gpgcheck=1 | |
| gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg | |
| EOF | |
| yum install -y docker | |
| setenforce 0 | |
| sed -i -e 's/^SELINUX=[a-z]*/SELINUX=disabled/' /etc/sysconfig/selinux | |
| sed -i -e 's/^SELINUX=[a-z]*/SELINUX=disabled/' /etc/selinux/config | |
| yum install -y kubelet kubeadm kubectl | |
| systemctl start docker && systemctl enable docker | |
| echo net.bridge.bridge-nf-call-ip6tables=1 > /etc/sysctl.d/k8s.conf | |
| echo net.bridge.bridge-nf-call-iptables=1 >> /etc/sysctl.d/k8s.conf | |
| echo net.ipv4.ip_nonlocal_bind=1 > /etc/sysctl.d/nginx.conf | |
| sysctl --system | |
| docker run -d --net=host --cap-add NET_ADMIN \ | |
| --name k8s-api-keepalived --restart=always \ | |
| -e KEEPALIVED_AUTOCONF=true \ | |
| -e KEEPALIVED_STATE=MASTER \ | |
| -e KEEPALIVED_INTERFACE=$INTERFACE \ | |
| -e KEEPALIVED_VIRTUAL_ROUTER_ID=2 \ | |
| -e KEEPALIVED_UNICAST_PEER_1=$CP1_IP \ | |
| -e KEEPALIVED_UNICAST_PEER_2=$CP2_IP \ | |
| -e KEEPALIVED_TRACK_INTERFACE_1=$INTERFACE \ | |
| -e KEEPALIVED_VIRTUAL_IPADDRESS_1="$LOAD_BALANCER_IP$NETMASK_CIDR dev $INTERFACE" \ | |
| arcts/keepalived | |
| mkdir /etc/nginx | |
| cat >/etc/nginx/nginx.conf <<_EOF | |
| worker_processes auto; | |
| error_log stderr warn; | |
| events { | |
| worker_connections 1024; | |
| } | |
| stream { | |
| upstream apiserver { | |
| server $CP0_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| server $CP1_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| server $CP2_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| } | |
| server { | |
| listen $LOAD_BALANCER_IP:$LOAD_BALANCER_PORT; | |
| proxy_connect_timeout 4s; | |
| proxy_timeout 90s; | |
| proxy_pass apiserver; | |
| } | |
| } | |
| _EOF | |
| docker run -d --net=host --memory=512M -v /etc/nginx:/etc/nginx \ | |
| --name k8s-api-proxy --restart=always \ | |
| -p $LOAD_BALANCER_IP:$LOAD_BALANCER_PORT:$LOAD_BALANCER_PORT \ | |
| nginx:alpine | |
| cat > kubeadm-config.yaml <<_EOF | |
| apiVersion: kubeadm.k8s.io/v1alpha2 | |
| kind: MasterConfiguration | |
| kubernetesVersion: v1.11.1 | |
| apiServerCertSANs: | |
| - "$LOAD_BALANCER_DNS" | |
| api: | |
| controlPlaneEndpoint: "$LOAD_BALANCER_DNS:$LOAD_BALANCER_PORT" | |
| bindAddress: $CP0_IP | |
| apiServerExtraArgs: | |
| bind-address: $CP0_IP | |
| etcd: | |
| local: | |
| extraArgs: | |
| listen-client-urls: "https://127.0.0.1:2379,https://$CP0_IP:2379" | |
| advertise-client-urls: "https://$CP0_IP:2379" | |
| listen-peer-urls: "https://$CP0_IP:2380" | |
| initial-advertise-peer-urls: "https://$CP0_IP:2380" | |
| initial-cluster: "$CP0_HOSTNAME=https://$CP0_IP:2380" | |
| serverCertSANs: | |
| - $CP0_HOSTNAME | |
| - $CP0_IP | |
| peerCertSANs: | |
| - $CP0_HOSTNAME | |
| - $CP0_IP | |
| kubeletConfiguration: | |
| baseConfig: | |
| clusterDomain: k8s-lab.our.local.domain | |
| networking: | |
| dnsDomain: k8s-lab.our.local.domain | |
| podSubnet: "10.32.0.0/12" # default for weave cni | |
| _EOF | |
| kubeadm init --config kubeadm-config.yaml --ignore-preflight-errors=Port-6443 | |
| # work around bug where kubelet starts but host stays NotReady because networking doesn't start, with kubelet's log showing: | |
| # Jul 26 15:20:27 k8s-lab1 kubelet[1584]: W0726 15:20:27.407413 1584 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d | |
| # Jul 26 15:20:27 k8s-lab1 kubelet[1584]: E0726 15:20:27.408491 1584 kubelet.go:2110] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: netwo...g uninitialized | |
| if [[ $(grep -c -- '--cni-conf-dir=/etc/cni' /var/lib/kubelet/kubeadm-flags.env) -eq 1 && ! -d /etc/cni ]]; then | |
| pushd /var/lib/kubelet/ | |
| awk '{print $1}' < kubeadm-flags.env > kubeadm-flags_fixed.env | |
| mv kubeadm-flags{,_broken}.env | |
| mv kubeadm-flags{_fixed,}.env | |
| popd | |
| fi | |
| systemctl enable kubelet && systemctl restart kubelet | |
| mkdir .kube | |
| ln -s /etc/kubernetes/admin.conf .kube/config | |
| tar -C /etc/kubernetes -cvf kube-keys.tar admin.conf pki/{ca.{crt,key},sa.{key,pub},front-proxy-ca.{crt,key},etcd/ca.{crt,key}} | |
| scp kube-keys.tar $CP1_HOSTNAME: | |
| scp kube-keys.tar $CP2_HOSTNAME: |
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| #!/bin/sh | |
| INTERFACE=eth0 | |
| NETMASK_CIDR='/24' # 255.255.255.0 | |
| LOAD_BALANCER_IP=192.168.1.100 | |
| LOAD_BALANCER_DNS=api-k8s-lab | |
| LOAD_BALANCER_PORT=6443 | |
| CP_PORT=6443 | |
| CP0_HOSTNAME=k8s-lab1 | |
| CP0_IP=192.168.1.101 | |
| CP1_HOSTNAME=k8s-lab2 | |
| CP1_IP=192.168.1.102 | |
| CP2_IP=192.168.1.103 | |
| set -x | |
| cat <<EOF > /etc/yum.repos.d/kubernetes.repo | |
| [kubernetes] | |
| name=Kubernetes | |
| baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 | |
| enabled=1 | |
| gpgcheck=1 | |
| repo_gpgcheck=1 | |
| gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg | |
| EOF | |
| yum install -y docker | |
| setenforce 0 | |
| sed -i -e 's/^SELINUX=[a-z]*/SELINUX=disabled/' /etc/sysconfig/selinux | |
| sed -i -e 's/^SELINUX=[a-z]*/SELINUX=disabled/' /etc/selinux/config | |
| yum install -y kubelet kubeadm kubectl | |
| systemctl start docker && systemctl enable docker | |
| echo net.bridge.bridge-nf-call-ip6tables=1 > /etc/sysctl.d/k8s.conf | |
| echo net.bridge.bridge-nf-call-iptables=1 >> /etc/sysctl.d/k8s.conf | |
| echo net.ipv4.ip_nonlocal_bind=1 > /etc/sysctl.d/nginx.conf | |
| sysctl --system | |
| docker run -d --net=host --cap-add NET_ADMIN \ | |
| --name k8s-api-keepalived --restart=always \ | |
| -e KEEPALIVED_AUTOCONF=true \ | |
| -e KEEPALIVED_STATE=BACKUP \ | |
| -e KEEPALIVED_INTERFACE=$INTERFACE \ | |
| -e KEEPALIVED_VIRTUAL_ROUTER_ID=2 \ | |
| -e KEEPALIVED_UNICAST_PEER_0=$CP0_IP \ | |
| -e KEEPALIVED_UNICAST_PEER_2=$CP2_IP \ | |
| -e KEEPALIVED_TRACK_INTERFACE_1=$INTERFACE \ | |
| -e KEEPALIVED_VIRTUAL_IPADDRESS_1="$LOAD_BALANCER_IP$NETMASK_CIDR dev $INTERFACE" \ | |
| arcts/keepalived | |
| mkdir /etc/nginx | |
| cat >/etc/nginx/nginx.conf <<_EOF | |
| worker_processes auto; | |
| error_log stderr warn; | |
| events { | |
| worker_connections 1024; | |
| } | |
| stream { | |
| upstream apiserver { | |
| server $CP0_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| server $CP1_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| server $CP2_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| } | |
| server { | |
| listen $LOAD_BALANCER_IP:$LOAD_BALANCER_PORT; | |
| proxy_connect_timeout 4s; | |
| proxy_timeout 90s; | |
| proxy_pass apiserver; | |
| } | |
| } | |
| _EOF | |
| docker run -d --net=host --memory=512M -v /etc/nginx:/etc/nginx \ | |
| --name k8s-api-proxy --restart=always \ | |
| -p $LOAD_BALANCER_IP:$LOAD_BALANCER_PORT:$LOAD_BALANCER_PORT \ | |
| nginx:alpine | |
| cat > kubeadm-config.yaml <<_EOF | |
| apiVersion: kubeadm.k8s.io/v1alpha2 | |
| kind: MasterConfiguration | |
| kubernetesVersion: v1.11.1 | |
| apiServerCertSANs: | |
| - "$LOAD_BALANCER_DNS" | |
| api: | |
| controlPlaneEndpoint: "$LOAD_BALANCER_DNS:$LOAD_BALANCER_PORT" | |
| bindAddress: $CP1_IP | |
| apiServerExtraArgs: | |
| bind-address: $CP1_IP | |
| etcd: | |
| local: | |
| extraArgs: | |
| listen-client-urls: "https://127.0.0.1:2379,https://$CP1_IP:2379" | |
| advertise-client-urls: "https://$CP1_IP:2379" | |
| listen-peer-urls: "https://$CP1_IP:2380" | |
| initial-advertise-peer-urls: "https://$CP1_IP:2380" | |
| initial-cluster: "$CP0_HOSTNAME=https://$CP0_IP:2380,$CP1_HOSTNAME=https://$CP1_IP:2380" | |
| initial-cluster-state: existing | |
| serverCertSANs: | |
| - $CP1_HOSTNAME | |
| - $CP1_IP | |
| peerCertSANs: | |
| - $CP1_HOSTNAME | |
| - $CP1_IP | |
| kubeletConfiguration: | |
| baseConfig: | |
| clusterDomain: k8s-lab.our.local.domain | |
| networking: | |
| dnsDomain: k8s-lab.our.local.domain | |
| podSubnet: "10.32.0.0/12" # default for weave cni | |
| _EOF | |
| if ! [[ -f kube-keys.tar ]]; then | |
| echo 'ERROR: tarball containing pki keys and admin.conf not copied here!' | |
| fi | |
| tar -C /etc/kubernetes -xvf kube-keys.tar | |
| kubeadm alpha phase certs all --config kubeadm-config.yaml | |
| kubeadm alpha phase kubelet config write-to-disk --config kubeadm-config.yaml | |
| kubeadm alpha phase kubelet write-env-file --config kubeadm-config.yaml | |
| kubeadm alpha phase kubeconfig kubelet --config kubeadm-config.yaml | |
| # work around bug where kubelet starts but host stays NotReady because networking doesn't start, with kubelet's log showing: | |
| # Jul 26 15:20:27 k8s-lab1 kubelet[1584]: W0726 15:20:27.407413 1584 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d | |
| # Jul 26 15:20:27 k8s-lab1 kubelet[1584]: E0726 15:20:27.408491 1584 kubelet.go:2110] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: netwo...g uninitialized | |
| if [[ $(grep -c -- '--cni-conf-dir=/etc/cni' /var/lib/kubelet/kubeadm-flags.env) -eq 1 && ! -d /etc/cni ]]; then | |
| pushd /var/lib/kubelet/ | |
| awk '{print $1}' < kubeadm-flags.env > kubeadm-flags_fixed.env | |
| mv kubeadm-flags{,_broken}.env | |
| mv kubeadm-flags{_fixed,}.env | |
| popd | |
| fi | |
| systemctl enable kubelet && systemctl restart kubelet | |
| mkdir .kube | |
| ln -s /etc/kubernetes/admin.conf .kube/config | |
| kubectl exec -n kube-system etcd-$CP0_HOSTNAME -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://$CP0_IP:2379 member add $CP1_HOSTNAME https://$CP1_IP:2380 | |
| kubeadm alpha phase etcd local --config kubeadm-config.yaml | |
| kubeadm alpha phase kubeconfig all --config kubeadm-config.yaml | |
| kubeadm alpha phase controlplane all --config kubeadm-config.yaml | |
| kubeadm alpha phase mark-master --config kubeadm-config.yaml |
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| #!/bin/sh | |
| INTERFACE=eth0 | |
| NETMASK_CIDR='/24' # 255.255.255.0 | |
| LOAD_BALANCER_IP=192.168.1.100 | |
| LOAD_BALANCER_DNS=api-k8s-lab | |
| LOAD_BALANCER_PORT=6443 | |
| CP_PORT=6443 | |
| CP0_HOSTNAME=k8s-lab1 | |
| CP0_IP=192.168.1.101 | |
| CP1_HOSTNAME=k8s-lab2 | |
| CP1_IP=192.168.1.102 | |
| CP2_HOSTNAME=k8s-lab3 | |
| CP2_IP=192.168.1.103 | |
| set -x | |
| cat <<EOF > /etc/yum.repos.d/kubernetes.repo | |
| [kubernetes] | |
| name=Kubernetes | |
| baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 | |
| enabled=1 | |
| gpgcheck=1 | |
| repo_gpgcheck=1 | |
| gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg | |
| EOF | |
| yum install -y docker | |
| setenforce 0 | |
| sed -i -e 's/^SELINUX=[a-z]*/SELINUX=disabled/' /etc/sysconfig/selinux | |
| sed -i -e 's/^SELINUX=[a-z]*/SELINUX=disabled/' /etc/selinux/config | |
| yum install -y kubelet kubeadm kubectl | |
| systemctl start docker && systemctl enable docker | |
| echo net.bridge.bridge-nf-call-ip6tables=1 > /etc/sysctl.d/k8s.conf | |
| echo net.bridge.bridge-nf-call-iptables=1 >> /etc/sysctl.d/k8s.conf | |
| echo net.ipv4.ip_nonlocal_bind=1 > /etc/sysctl.d/nginx.conf | |
| sysctl --system | |
| docker run -d --net=host --cap-add NET_ADMIN \ | |
| --name k8s-api-keepalived --restart=always \ | |
| -e KEEPALIVED_AUTOCONF=true \ | |
| -e KEEPALIVED_STATE=BACKUP \ | |
| -e KEEPALIVED_INTERFACE=$INTERFACE \ | |
| -e KEEPALIVED_VIRTUAL_ROUTER_ID=2 \ | |
| -e KEEPALIVED_UNICAST_PEER_0=$CP0_IP \ | |
| -e KEEPALIVED_UNICAST_PEER_1=$CP1_IP \ | |
| -e KEEPALIVED_TRACK_INTERFACE_1=$INTERFACE \ | |
| -e KEEPALIVED_VIRTUAL_IPADDRESS_1="$LOAD_BALANCER_IP$NETMASK_CIDR dev $INTERFACE" \ | |
| arcts/keepalived | |
| mkdir /etc/nginx | |
| cat >/etc/nginx/nginx.conf <<_EOF | |
| worker_processes auto; | |
| error_log stderr warn; | |
| events { | |
| worker_connections 1024; | |
| } | |
| stream { | |
| upstream apiserver { | |
| server $CP0_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| server $CP1_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| server $CP2_IP:$CP_PORT weight=5 max_fails=3 fail_timeout=30s; | |
| } | |
| server { | |
| listen $LOAD_BALANCER_IP:$LOAD_BALANCER_PORT; | |
| proxy_connect_timeout 4s; | |
| proxy_timeout 90s; | |
| proxy_pass apiserver; | |
| } | |
| } | |
| _EOF | |
| docker run -d --net=host --memory=512M -v /etc/nginx:/etc/nginx \ | |
| --name k8s-api-proxy --restart=always \ | |
| -p $LOAD_BALANCER_IP:$LOAD_BALANCER_PORT:$LOAD_BALANCER_PORT \ | |
| nginx:alpine | |
| cat > kubeadm-config.yaml <<_EOF | |
| apiVersion: kubeadm.k8s.io/v1alpha2 | |
| kind: MasterConfiguration | |
| kubernetesVersion: v1.11.1 | |
| apiServerCertSANs: | |
| - "$LOAD_BALANCER_DNS" | |
| api: | |
| controlPlaneEndpoint: "$LOAD_BALANCER_DNS:$LOAD_BALANCER_PORT" | |
| bindAddress: $CP2_IP | |
| apiServerExtraArgs: | |
| bind-address: $CP2_IP | |
| etcd: | |
| local: | |
| extraArgs: | |
| listen-client-urls: "https://127.0.0.1:2379,https://$CP2_IP:2379" | |
| advertise-client-urls: "https://$CP2_IP:2379" | |
| listen-peer-urls: "https://$CP2_IP:2380" | |
| initial-advertise-peer-urls: "https://$CP2_IP:2380" | |
| initial-cluster: "$CP0_HOSTNAME=https://$CP0_IP:2380,$CP1_HOSTNAME=https://$CP1_IP:2380,$CP2_HOSTNAME=https://$CP2_IP:2380" | |
| initial-cluster-state: existing | |
| serverCertSANs: | |
| - $CP2_HOSTNAME | |
| - $CP2_IP | |
| peerCertSANs: | |
| - $CP2_HOSTNAME | |
| - $CP2_IP | |
| kubeletConfiguration: | |
| baseConfig: | |
| clusterDomain: k8s-lab.our.local.domain | |
| networking: | |
| dnsDomain: k8s-lab.our.local.domain | |
| podSubnet: "10.32.0.0/12" # default for weave cni | |
| _EOF | |
| if ! [[ -f kube-keys.tar ]]; then | |
| echo 'ERROR: tarball containing pki keys and admin.conf not copied here!' | |
| fi | |
| tar -C /etc/kubernetes -xvf kube-keys.tar | |
| kubeadm alpha phase certs all --config kubeadm-config.yaml | |
| kubeadm alpha phase kubelet config write-to-disk --config kubeadm-config.yaml | |
| kubeadm alpha phase kubelet write-env-file --config kubeadm-config.yaml | |
| kubeadm alpha phase kubeconfig kubelet --config kubeadm-config.yaml | |
| # work around bug where kubelet starts but host stays NotReady because networking doesn't start, with kubelet's log showing: | |
| # Jul 26 15:20:27 k8s-lab1 kubelet[1584]: W0726 15:20:27.407413 1584 cni.go:172] Unable to update cni config: No networks found in /etc/cni/net.d | |
| # Jul 26 15:20:27 k8s-lab1 kubelet[1584]: E0726 15:20:27.408491 1584 kubelet.go:2110] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: netwo...g uninitialized | |
| if [[ $(grep -c -- '--cni-conf-dir=/etc/cni' /var/lib/kubelet/kubeadm-flags.env) -eq 1 && ! -d /etc/cni ]]; then | |
| pushd /var/lib/kubelet/ | |
| awk '{print $1}' < kubeadm-flags.env > kubeadm-flags_fixed.env | |
| mv kubeadm-flags{,_broken}.env | |
| mv kubeadm-flags{_fixed,}.env | |
| popd | |
| fi | |
| systemctl enable kubelet && systemctl restart kubelet | |
| mkdir .kube | |
| ln -s /etc/kubernetes/admin.conf .kube/config | |
| kubectl exec -n kube-system etcd-$CP0_HOSTNAME -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://$CP0_IP:2379 member add $CP2_HOSTNAME https://$CP2_IP:2380 | |
| kubeadm alpha phase etcd local --config kubeadm-config.yaml | |
| kubeadm alpha phase kubeconfig all --config kubeadm-config.yaml | |
| kubeadm alpha phase controlplane all --config kubeadm-config.yaml | |
| kubeadm alpha phase mark-master --config kubeadm-config.yaml | |
| kubectl taint nodes --all node-role.kubernetes.io/master- |
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