When installing the k8sV1.16 version today, the execution suddenly found that the command was wrong. It was possible to install V1.15 before, which may be the reason for the version upgrade.
Solution:
unknown flag: –experimental-upload-certs, replace –experimental-upload-certs with –upload-certs
[root@k8s-master opt]# kubeadm init --config=kubeadm-config.yaml --experimental-upload-certs | tee kubeadm-init.log
Error: unknown flag: --experimental-upload-certs
Usage:
kubeadm init [flags]
kubeadm init [command]
Available Commands:
phase Use this command to invoke single phase of the init workflow
Flags:
--apiserver-advertise-address string The IP address the API Server will advertise it's listening on. If not set the default network interface will be used.
--apiserver-bind-port int32 Port for the API Server to bind to. (default 6443)
--apiserver-cert-extra-sans strings Optional extra Subject Alternative Names (SANs) to use for the API Server serving certificate. Can be both IP addresses and DNS names.
--cert-dir string The path where to save and store the certificates. (default "/etc/kubernetes/pki")
--certificate-key string Key used to encrypt the control-plane certificates in the kubeadm-certs Secret.
--config string Path to a kubeadm configuration file.
--control-plane-endpoint string Specify a stable IP address or DNS name for the control plane.
--cri-socket string Path to the CRI socket to connect. If empty kubeadm will try to auto-detect this value; use this option only if you have more than one CRI installed or if you have non-standard CRI socket.
--dry-run Don't apply any changes; just output what would be done.
-k, --experimental-kustomize string The path where kustomize patches for static pod manifests are stored.
--feature-gates string A set of key=value pairs that describe feature gates for various features. Options are:
IPv6DualStack=true|false (ALPHA - default=false)
-h, --help help for init
--ignore-preflight-errors strings A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks.
--image-repository string Choose a container registry to pull control plane images from (default "k8s.gcr.io")
--kubernetes-version string Choose a specific Kubernetes version for the control plane. (default "stable-1")
--node-name string Specify the node name.
--pod-network-cidr string Specify range of IP addresses for the pod network. If set, the control plane will automatically allocate CIDRs for every node.
--service-cidr string Use alternative range of IP address for service VIPs. (default "10.96.0.0/12")
--service-dns-domain string Use alternative domain for services, e.g. "myorg.internal". (default "cluster.local")
--skip-certificate-key-print Don't print the key used to encrypt the control-plane certificates.
--skip-phases strings List of phases to be skipped
--skip-token-print Skip printing of the default bootstrap token generated by 'kubeadm init'.
--token string The token to use for establishing bidirectional trust between nodes and control-plane nodes. The format is [a-z0-9]{6}\.[a-z0-9]{16} - e.g. abcdef.0123456789abcdef
--token-ttl duration The duration before the token is automatically deleted (e.g. 1s, 2m, 3h). If set to '0', the token will never expire (default 24h0m0s)
--upload-certs Upload control-plane certificates to the kubeadm-certs Secret.
Global Flags:
--add-dir-header If true, adds the file directory to the header
--log-file string If non-empty, use this log file
--log-file-max-size uint Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
--rootfs string [EXPERIMENTAL] The path to the 'real' host root filesystem.
--skip-headers If true, avoid header prefixes in the log messages
--skip-log-headers If true, avoid headers when opening log files
-v, --v Level number for the log level verbosity
Use "kubeadm init [command] --help" for more information about a command.
unknown flag: --experimental-upload-certs
To see the stack trace of this error execute with --v=5 or higher
[root@k8s-master opt]# kubeadm init --config=kubeadm-config.yaml --upload-certs | tee kubeadm-init.log
[init] Using Kubernetes version : v1 .16 .1
[preflight] Running pre-flight checks
[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
[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" certificate and key
[certs] apiserver serving cert is signed for DNS names [k8s-master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.180.121]
[certs] Generating "apiserver-kubelet-client" certificate and key
[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/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.180.121 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.180.121 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file