Kubernetes setup script

Host OS:

CentOS 7 or RedHat EL 7.4+

Components:

• etcd: 3.3.12
• flannel: 0.5.5
• kubernetes: 1.14.0
• docker: 18.09.4

Features:

TLS/SSL enabled with self-signed certificates Restriction on access to API Server (kubeconfig with certificates and keys is required) (This is turned off for easy access to dashboard. Can be turned on manually)

Usage

• Configure settings.sh, main items:
  1. ETCD_SERVER_IP: etcd loadbalancer IP or one of the IPs in ETCD_IPS
  2. API_SERVER_IP: API server IP or one of the IPs in MASTER_IPS
  3. IP & hostname list of etcd, master and worker 3 components can run on the same node or separately, depending on which list the node is in. Single node is a special case when all 3 set of lists contain exact the same IP and hostname.
• After configuration of settings.sh, run:
  1. ./download-binaries.sh #This only needs to run once. We can keep the downloaded files in folder 'binaries'
  2. ./generate-settings.sh #This generates the certs and all the setting files
  3. copy the whole script directory to all nodes, including changed settings.sh, other scripts, binaries and generated files under 'generated-files' folder
  4. Run ./install-kubernetes.sh on all nodes in the order of etcd -> master -> worker
• Uninstall: run ./uninstall.sh on all nodes in the order of master -> worker -> etcd