![](https://www.devopsschool.com/blog/wp-content/uploads/2019/08/KUBERNETES-ERRORS-KUBEADM-RELATED-ERRORS-AND-SOLUTIONS-.png)
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=all
Error 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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Kubernetes – CKA Certification Overview – By DevOpsSchool.com
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 1 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 2 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 3 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 4 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 5 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 6 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 7 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 8 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 9 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 10 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 11 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 12 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 13 out 14 | — By DevOpsSchool
![play](https://www.devopsschool.com/blog/wp-content/plugins/youtube-embed-plus/images/playhover.png)
Kubernetes – CKA Certification | Part 14 out 14 | — By DevOpsSchool
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