config.sh

1. #!/usr/bin/env bash

3. # vim configuration 

4. echo 'alias vi=vim' >> /etc/profile

6. # swapoff -a to disable swapping

7. swapoff -a

8. # sed to comment the swap partition in /etc/fstab

9. sed -i.bak -r 's/(.+ swap .+)/ #\1/' /etc/fstab

11. # kubernetes repo

12. gg_pkg="packages.cloud.google.com/yum/doc" # Due to shorten addr for key

13. cat <<EOF > /etc/yum.repos.d/kubernetes.repo

14. [kubernetes]

15. name=Kubernetes

16. baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64

17. enabled=1

18. gpgcheck=0

19. repo_gpgcheck=0

20. gpgkey=https://${gg_pkg}/yum-key.gpg https://${gg_pkg}/rpm-package-key.gpg

21. EOF

23. # Set SELinux in permissive mode (effectively disabling it)

24. setenforce 0

25. sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

27. # RHEL/CentOS 7 have reported traffic issues being routed incorrectly due to iptables bypassed

28. cat <<EOF >  /etc/sysctl.d/k8s.conf

29. net.bridge.bridge-nf-call-ip6tables = 1

30. net.bridge.bridge-nf-call-iptables = 1

31. EOF

32. modprobe br_netfilter

34. # local small dns & vagrant cannot parse and delivery shell code.

35. echo "192.168.1.10 m-k8s" >> /etc/hosts

36. for (( i=1; i<=$1; i++  )); do echo "192.168.1.10$i w$i-k8s" >> /etc/hosts; done

38. # config DNS  

39. cat <<EOF > /etc/resolv.conf

40. nameserver 1.1.1.1 #cloudflare DNS

41. nameserver 8.8.8.8 #Google DNS

42. EOF