Devops on myblog

Sleeping-Hacker

Sat, 04 Nov 2023 21:29:01 +0800

Consul

Mon, 08 May 2023 21:29:01 +0800

Consul provides feature such as:

Service discovery
Tagging
Health checks
Secure Service Communication
Multi Datacenter
System-wide key/value storage

Server vs Client

Server:

running on individual machine

form a failsafe cluster

communicating with client machine

Client:

working on machine were running service

checking health of server

sending information on server

example config registration service

`{ "service":{"name": "web", "tags":["be"], "port": 80,"check":{"args": ["curl", "localhost"], "interval": "10s" }}}`

Instal consul

create account consul

useradd -s /bin/false -m consul

download binar file https://developer.hashicorp.com/consul/downloads for ubuntu

ELK Stack

Mon, 08 May 2023 21:29:01 +0800

ELK Stack

Elasticsearch

is search and analytics engine that is widely used for full-text search, log and event data analysis

storage
analytics
search

Shard - shard is a basic unit of storage and search

Indexer - logical space for storing shards

Logstach

Kibana

Download and install the Debian package manually

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-8.11.1-amd64.deb
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-8.11.1-amd64.deb.sha512
shasum -a 512 -c elasticsearch-8.11.1-amd64.deb.sha512 
sudo dpkg -i elasticsearch-8.11.1-amd64.deb

after install take password from cli

Jenkins

Fri, 08 May 2020 21:29:01 +0800

Jenkins

Check for the latest updates and install wget

sudo apt-get update && sudo apt install wget

Configuring limits

Edit the file limit.conf

sudo vi /etc/security/limits.conf

Adding content:

jenkins      soft     core    unlimited
jenkins      hard     hard    unlimited
jenkins      soft     fsize   unlimited
jenkins      soft     fsize   unlimited
jenkins      soft     nofile  4096
jenkins      hard     nofile  8192
jenkins      soft     nproc   30654
jenkins      hard     nproc   30654

Configure the firewall

sudo apt-get install ufw

sudo ufw allow OpenSSH

sudo ufw allow 8080

sudo ufw enable

Check ufw’s status to confirm the new rules: