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How to Configure Consul in a Production Environment on Ubuntu 14.04

Install Consul :

#Download Consul :

Below are the available downloads for the latest version of Consul (0.8.5). Please download the proper package for your operating system and architecture.

$ cd /usr/local/bin

$ sudo wget https://releases.hashicorp.com/consul/0.8.5/consul_0.8.5_linux_amd64.zip

$ unzip *.zip

$ rm *.zip

#Create Consul User :  

$ adduser consul

#Make a directory 

$ mkdir -p /etc/consul.d/{bootstrap,server,client}

$ mkdir /var/consul

$ chown consul:consul /var/consul

$ chown consul:consul /var/consul

##  Creating the Bootstrap Configuration ##

$ sudo vi /etc/consul.d/bootstrap/config.json

##  Create the first file in the bootstrap subdirectory: 
{
    "bootstrap": true,
    "server": true,
    "datacenter": "nyc2",
    "data_dir": "/var/consul"
}


## In the terminal, we can use the consul command to generate a key of the necessary length and encoding. Type:

$ sudo consul keygen 

Output=> X4SYOinf2pTAcAHRhpj7dA==

##Copy the value that is generated and re-open the configuration file:

$ sudo vi /etc/consul.d/bootstrap/config.json

{
    "bootstrap": true,
    "server": true,
    "datacenter": "nyc2",
    "data_dir": "/var/consul",
    "encrypt": "X4SYOinf2pTAcAHRhpj7dA==",
    "log_level": "INFO",
    "enable_syslog": true
}


$ sudo cp /etc/consul.d/bootstrap/config.json /etc/consul.d/server

## Open the file to make the necessary modifications:

$ sudo vi  /etc/consul.d/server/config.json
{
    "bootstrap": false,
    "server": true,
    "datacenter": "nyc2",
    "data_dir": "/var/consul",
    "encrypt": "X4SYOinf2pTAcAHRhpj7dA==",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.0.2.2", "192.0.2.3"]
}

Save and close the files you have created when you are finished.

## Creating the Client Configuration ##

$ sudo vi /etc/consul.d/client/config.json

## Finally, we want to adjust the start_join parameter to list all of our servers:

{
    "server": false,
    "datacenter": "nyc2",
    "data_dir": "/var/consul",
    "ui_dir": "/home/consul/dist",
    "encrypt": "X4SYOinf2pTAcAHRhpj7dA==",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.0.2.1", "192.0.2.2", "192.0.2.3"]
}


## ---------Create an Upstart Script------##

$ sudo vi /etc/init/consul.conf

## INSERT SERVER File :

description "Consul server process"

start on (local-filesystems and net-device-up IFACE=eth0)
stop on runlevel [!12345]

respawn

setuid consul
setgid consul

exec consul agent -config-dir /etc/consul.d/server


## INSERT CLINET FILE :

description "Consul client process"

start on (local-filesystems and net-device-up IFACE=eth0)
stop on runlevel [!12345]

respawn

setuid consul
setgid consul

exec consul agent -config-dir /etc/consul.d/client


## Save the file when you are finished.


###-------- Getting a Cluster Started---- ##
$ sudo  su consul
$ sudo  consul agent -config-dir /etc/consul.d/bootstrap

$ start consul

$ consul members
Node                Address            Status  Type    Build     Protocol  DC
Armons-MacBook-Air  172.20.20.11:8301  alive   server  0.6.1dev  2         dc1

$ curl localhost:8500/v1/catalog/nodes

[{"Node":"Armons-MacBook-Air","Address":"127.0.0.1","TaggedAddresses":{"lan":"127.0.0.1","wan":"127.0.0.1"},"CreateIndex":4,"ModifyIndex":110}]

$ dig @127.0.0.1 -p 8600 Armons-MacBook-Air.node.consul
...

;; QUESTION SECTION:
;Armons-MacBook-Air.node.consul.    IN  A

;; ANSWER SECTION:
Armons-MacBook-Air.node.consul. 0 IN    A   127.0.0.1

$ sudo ps aux | grep 8500
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Comments

  1. Azure DevOps14 October 2019 at 03:02

    Informative blog. Thank you for sharing with us..
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  2. Anu25 July 2020 at 21:44


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