Error 1
root@ubuntu-VirtualBox:~# kubeadm init
[init] using Kubernetes version: v1.12.2
[preflight] running pre-flight checks
[preflight] Some fatal errors occurred:
[ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=..Error 1
root@ubuntu-VirtualBox:~# kubeadm init
[init] using Kubernetes version: v1.12.2
[preflight] running pre-flight checks
[preflight] Some fatal errors occurred:
[ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=..Error 2
root@ubuntu-VirtualBox:~# kubeadm init
[init] using Kubernetes version: v1.12.2
[preflight] running pre-flight checks
[preflight] Some fatal errors occurred:
[ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=..Error 3
[root@ip-172-31-31-11 ec2-user]# kubeadm init
[init] Using Kubernetes version: v1.13.3
[preflight] Running pre-flight checks
[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 18.09.1. Latest validated version: 18.06
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
Solutions 3
kubeadm init --ignore-preflight-errors=allError 4
[root@ip-172-31-31-11 ec2-user]# kubeadm init
[init] Using Kubernetes version: v1.13.3
[preflight] Running pre-flight checks
[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 18.09.1. Latest validated version: 18.06
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`Solutions 4
vi /etc/sysctl.conf
# For more information, see sysctl.conf(5) and sysctl.d(5).
net.bridge.bridge-nf-call-iptables = 1
# Verify and Make Effective
$ sudo sysctl -p
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