kubernets集群部署问题
1、hostname “master” could not be reached
在host中没有加解析
2、curl -sSL http://localhost:10248/healthz
curl: (7) Failed connect to localhost:10248; 拒绝连接 在host中没有localhost的解析
3、Error starting daemon: SELinux is not supported with the overlay2 graph driver on this kernel. Either boot into a newer kernel or…abled=false)
vim /etc/ssconfig/docker --selinux-enabled=False
4、bridge-nf-call-iptables 固化的问题：
#下面的是关于bridge的配置：
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 1
#意味着二层的网络在转发包的时候会被iptables的forward规则过滤 net.bridge.bridge-nf-call-arptables = 0
5、The connection to the server localhost:8080 was refused - did you specify the right host or port?
unable to recognize "kube-flannel.yml": Get http://localhost:8080/api?timeout=32s: dial tcp [::1]:8080: connect: connection refused
下面如果在root用户下执行的，就不会报错
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
6、error: unable to recognize “mycronjob.yml”: no matches for kind “CronJob” in version “batch/v2alpha1”
去kube-apiserver.yaml文件中添加： - --runtime-config=batch/v2alpha1=true，然后重启kubelet服务，就可以了
7、Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized Unable to update cni config: No networks found in /etc/cni/net.d Failed to get system container stats for “/system.slice/kubelet.service”: failed to get cgroup stats for “/system.slice/kubelet.service”: failed to get container info for “/system.slice/kubelet.service”: unknown container “/system.slice/kubelet.service”
docker pull quay.io/coreos/flannel:v0.10.0-amd64
mkdir -p /etc/cni/net.d/
cat <<EOF> /etc/cni/net.d/10-flannel.conf
{"name":"cbr0","type":"flannel","delegate": {"isDefaultGateway": true}}
EOF
mkdir /usr/share/oci-umount/oci-umount.d -p
mkdir /run/flannel/
cat <<EOF> /run/flannel/subnet.env
FLANNEL_NETWORK=172.100.0.0/16
FLANNEL_SUBNET=172.100.1.0/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true
EOF
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml
8、Unable to connect to the server: x509: certificate signed by unknown authority (possibly because of “crypto/rsa: verification error” while trying to verify candidate authority certificate “kubernetes”)
export KUBECONFIG=/etc/kubernetes/kubelet.conf
9、Failed to get system container stats for “/system.slice/docker.service”: failed to get cgroup stats for “/system.slice/docker.service”: failed to get container info for “/system.slice/docker.service”: unknown container “/system.slice/docker.service”
vim /etc/sysconfig/kubelet --runtime-cgroups=/systemd/system.slice --kubelet-cgroups=/systemd/system.slice systemctl restart kubelet
大概意思是Flag --cgroup-driver --kubelet-cgroups 驱动已经被禁用，这个参数应该通过kubelet 的配置指定配置文件来配置
10、The HTTP call equal to ‘curl -sSL http://localhost:10255/healthz’ failed with error: Get http://localhost:10255/healthz: dial tcp 127.0.0.1:10255: getsockopt: connection refused.
vim /etc/systemd/system/kubelet.service.d/10-kubeadm.conf Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --fail-swap-on=false"
11、failed to run Kubelet: failed to create kubelet: miscon figuration: kubelet cgroup driver: “systemd” is different from docker cgroup driver: “cgroupfs”
kubelet： Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=systemd" docker： vi /lib/systemd/system/docker.service -exec-opt native.cgroupdriver=systemd
12、[ERROR CRI]: unable to check if the container runtime at “/var/run/dockershim.sock” is running: exit status 1
rm -f /usr/bin/crictl
13、 Warning FailedScheduling 2s (x7 over 33s) default-scheduler 0/4 nodes are available: 4 node(s) didn’t match node selector.
如果指定的label在所有node上都无法匹配，则创建Pod失败，会提示无法调度：
14、kubeadm 生成的token过期后，集群增加节点
kubeadm token create
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null |
openssl dgst -sha256 -hex | sed ‘s/^.* //‘
kubeadm join --token aa78f6.8b4cafc8ed26c34f --discovery-token-ca-cert-hash sha256:0fd95a9bc67a7bf0ef42da968a0d55d92e52898ec37c971bd77ee501d845b538 172.16.6.79:6443 --skip-preflight-checks
15、systemctl status kubelet告警
cni.go:171] Unable to update cni config: No networks found in /etc/cni/net.d
May 29 06:30:28 fnode kubelet[4136]: E0529 06:30:28.935309 4136 kubelet.go:2130] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
删除 /etc/systemd/system/kubelet.service.d/10-kubeadm.conf 的 KUBELET_NETWORK_ARGS，然后重启kubelet服务 临时解决。没啥用
根本原因是缺少： k8s.gcr.io/pause-amd64:3.1
16 删除flannel网络
ifconfig cni0 down
ifconfig flannel.1 down
ifconfig del flannel.1
ifconfig del cni0
ip link del flannel.1
ip link del cni0
yum install bridge-utils
brctl delbr flannel.1
brctl delbr cni0
rm -rf /var/lib/cni/flannel/* && rm -rf /var/lib/cni/networks/cbr0/* && ip link delete cni0 && rm -rf /var/lib/cni/network/cni0/*
17、E0906 15:10:55.415662 1 leaderelection.go:234] error retrieving resource lock default/ceph.com-rbd: endpoints “ceph.com-rbd” is forbidden: User “system:serviceaccount:default:rbd-provisioner” cannot get endpoints in the namespace “default”
添加下面的这一段 （会重新申请资源） kubectl apply -f ceph/rbd/deploy/rbac/clusterrole.yaml
apiGroups: [""]
resources: [“endpoints”]
verbs: [“get”, “list”, “watch”, “create”, “update”, “patch”]`
