CI/CD Setup On SDC Steps to setup CI/CD on SDC
Topics covered:
Overview
Kubespray is a composition of Ansible playbooks, inventory , provisioning tools, and domain knowledge for generic OS/Kubernetes cluster configuration management tasks. Kubespray provides:
a highly available cluster
support for most popular Linux distributions
continuous-integration tests
Pre-requisites
Fork the repos below to your GitHub Organization account
Install kubectl on your local machine to interact with the Kubernetes cluster.
Install Helm to help package the services along with the configurations, environment, secrets, etc into Kubernetes manifests .
Hardware
One Bastion machine to run Kubespray
HA-PROXY machine which acts as a load balancer with Public IP. (CPU: 2Core , Memory: 4Gb)
one machine which acts as a master node. (CPU: 2Core , Memory: 4Gb)
one machine which acts as a worker node. (CPU: 8Core , Memory: 16Gb)
ISCSI volumes for persistence volume. (number of quantity: 2 )
kaniko-cache-claim:- 10Gb
Software
Preparing The Nodes
Run and follow instructions on all nodes.
Install Python
Ansible needs Python to be installed on all the machines.
apt-get update && apt-get install python3-pip -y
Disable Swap
Copy sudo swapoff -a
sudo sed -i '/ swap /d' /etc/fstab Setup SSH using key-based authentication
All the machines should be in the same network with ubuntu or centos installed.
ssh key should be generated from the Bastion machine and must be copied to all the servers part of your inventory.
Generate the ssh key ssh-keygen -t rsa
Copy over the public key to all nodes.
Copy ssh-copy-id root@<node-ip-address> Setup Ansible Controller machine Setup kubespray
Clone the official repository
Copy git clone https://github.com/kubernetes-incubator/kubespray.git
Install dependencies from requirements.txt
Copy sudo pip install -r requirements.txt
Copy cp -rfp inventory/sample inventory/mycluster where mycluster is the custom configuration name. Replace with whatever name you would like to assign to the current cluster.
Create inventory using an inventory generator.
Copy declare -a IPS=(10.67.53.158 10.67.53.159 )
CONFIG_FILE=inventory/mycluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]} Once it runs, you can see an inventory file that looks like the below:
Copy all:
hosts:
node1:
ansible_host: 10.67.53.158
ip: 10.67.53.158
access_ip: 10.67.53.158
node2:
ansible_host: 10.67.53.159
ip: 10.67.53.159
access_ip: 10.67.53.159
children:
kube-master:
hosts:
node1:
kube-node:
hosts:
node1:
node2:
etcd:
hosts:
node1:
k8s-cluster:
children:
kube-master:
kube-node:
calico-rr:
hosts: {}
Review and change parameters under inventory/mycluster/group_vars
Copy vim inventory/mycluster/group_vars/all/all.yml
...
## External LB example config
## apiserver_loadbalancer_domain_name: "elb.some.domain"
apiserver_loadbalancer_domain_name: "10.211.55.101"
loadbalancer_apiserver:
address: 10.211.55.101
port: 443
Deploy Kubespray with Ansible Playbook - run the playbook as Ubuntu
The option --become is required, for example writing SSL keys in /etc/, installing packages and interacting with various system daemons.
Note: Without --become - the playbook will fail to run!
Copy ansible-playbook -i inventory/mycluster/hosts.yaml --become --become-user=ubuntu cluster.yml Kubernetes cluster will be created with three masters and four nodes with the above process.
Kube config will be generated in a .Kubefolder. The cluster can be accessible via kubeconfig.
HA-Proxy
Install haproxy package in a haproxy machine that will be allocated for proxy
sudo apt-get install haproxy -y
IPs need to be whitelisted as per the requirements in the config.
sudo vim /etc/haproxy/haproxy.cfg
Copy global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
stats timeout 30s
user haproxy
group haproxy
daemon
# Default SSL material locations
# ca-base /etc/ssl/certs
# crt-base /etc/ssl/private
# Default ciphers to use on SSL-enabled listening sockets.
# For more information, see ciphers(1SSL). This list is from:
# https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
# An alternative list with additional directives can be obtained from
# https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
#ssl-default-bind-ciphers
#ssl-default-bind-options no-sslv3
defaults
log global
mode http
option httplog
option dontlognull
timeout connect 5000
timeout check 5000
timeout client 30000
timeout server 60000
frontend http-in
bind *:80
mode tcp
default_backend http-servers
http-request redirect scheme https unless { ssl_fc }
frontend https-in
bind *:443
mode tcp
default_backend https-servers
frontend kube-in
bind *:8383
mode tcp
timeout client 3h
#Jenkins_CD eGov_ACT eGov_Spectra
#acl network_allowed src 35.244.58.192 106.51.69.20 180.151.198.122 103.122.14.159 35.154.77.83 35.154.203.141 125.16.100.118 10.67.53.252 52.71.194.45 132.154.83.214 27.6.189.204 10.67.53.120
#tcp-request connection reject if !network_allowed
default_backend kube-servers
frontend kube2-in
bind *:6363
mode tcp
timeout client 3h
#Jenkins_CD eGov_ACT eGov_Spectra
acl network_allowed src 35.244.58.192 106.51.69.20 180.151.198.122 103.122.14.159 35.154.77.83 35.154.203.141 125.16.100.118 10.67.53.252 52.71.194.45 132.154.83.214 27.6.189.204 10.67.53.120
tcp-request connection reject if !network_allowed
default_backend kube-servers
backend http-servers
mode tcp
balance roundrobin
server srv4 10.67.53.159:32080 send-proxy
backend https-servers
mode tcp
balance roundrobin
server srv4 10.67.53.159:32443 send-proxy
backend kube-servers
mode tcp
option log-health-checks
timeout server 3h
server master1 10.67.53.158:6443 check check-ssl verify none inter 10000
balance roundrobin Volumes
Iscsi volumes will be provided by the SDC team as per the requisition and the same can be used for statefulsets.
Copy sudo iscsiadm -m discovery -t sendtargets -p 10.67.49.8:3260 CI/CD Build Job Pipeline Setup
Refer to the doc here .
