Setup Consul on a Single Server ~ Appychip

Thursday 12 May 2016

23:26

Setup Consul on a Single Server

Ajeet Khan consul on one host, consul setup, install consul on single server, installing consul on a single instance 9 comments

How to setup Consul on one instance

Running Consul on one instance

This installation guide assumes Ubuntu 14.04 OS, tmux and nginx already installed. Follow the below instruction to complete the consul installation.

Run the following command to download and install consul

cd /usr/local/bin
sudo wget https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_linux_amd64.zip
sudo unzip consul_0.6.4_linux_amd64.zip
sudo rm consul_0.6.4_linux_amd64.zip

Now the consul command should be ready to use

Download the web-ui of consul in /home/ubuntu/consul-ui/

cd ~
mkdir -p consul-ui
wget https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_web_ui.zip
unzip consul_0.6.4_web_ui.zip
sudo rm consul_0.6.4_web_ui.zip

Create the file config.json in /home/ubuntu/consul-config/server/ directory and put the following configuration in it. Here P.P.P.P is the private IP of the instance

{
    "bootstrap": true,
    "server": true,
    "log_level": "DEBUG",
    "enable_syslog": true,
    "datacenter": "dc1",
    "addresses" : {
      "http": "0.0.0.0"
    },
    "bind_addr": "P.P.P.P",
    "node_name": "P.P.P.P",
    "data_dir": "/home/ubuntu/consuldata",
    "ui_dir": "/home/ubuntu/consul-ui",
    "acl_datacenter": "dc1",
    "acl_master_token": "4f3fa35a-h3ab-45a2-914f-f82a34fab0c45",
    "acl_default_policy": "deny",
    "encrypt": "pXoaLOJ816mO+da8y8zrsg=="
}

Make consul.conf file in /etc/nginx/conf.d/ directory and put the following configurations in it

server
{
  listen 80 ;
  server_name myconsul.com;
  root /home/ubuntu/consul-ui;
      location / {
        proxy_pass http://127.0.0.1:8500;
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   Host      $http_host;
    }
}

Change myconsul.com to the the desired domain, save and exit. Restart the nginx server sudo service nginx restart.

Open a tmux session by running tmux command. Run the following command to start consul

consul agent -config-dir ~/consul-config/server -ui-dir ~/consul-ui -bootstrap true -client=0.0.0.0

Now, the consul should be running. Leave the process running by running ctrl+b than d. This will leave the tmux session running in which consul process was running.
The web-ui must be running on the public-ip or domain mentioned in the consul.conf file.

Note - If the link to download consul and web-ui doesn't work (in case of version of consul changed) than visit this page to get the right link.

The video Tutorial

COMMENT!

9 comments:

ivan16 May 2016 at 02:32
I think it makes more sense to add another 2 sections into this article: how to use docker in order to run consul in a single command, and how to setup single consul via init, upstart or systemd, instead of tmux.
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Anonymous11 January 2017 at 02:16
Do you have any documentation to setup two data center. getting some errors while adding with 1st data center.
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Ayo21 February 2017 at 12:25
Hi Ajeet, Hope your day is going great. I am very new to Consul, do you have instructions on how to set this up on RHEL 7? Thanks.
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Dilip Mevada8 June 2017 at 06:12
Hi,
I need your help to read data like these values
"configurationsettings/applicationsettings/configspecurl",
"configurationsettings/applicationsettings/maxhitsallowed",
"configurationsettings/applicationsettings/metadataserviceurl",
"configurationsettings/filelogsettings/errorLogPath",
"configurationsettings/filelogsettings/transactionLogPath",
"configurationsettings/getaroomsettings/ProductionUrl",
"configurationsettings/getaroomsettings/TestUrl"
into hierarchical format into C# class format like this

public class ConfigurationSettings
{
public ApplicationSettings applicationSettings { get; set; }
public SupplierSettings supplierSettings { get; set; }
}

public class ApplicationSettings
{
public string MetadataServiceUrl { get; set; }
}

public class SupplierSettings
{
public string TestUrl { get; set; }
}

Please help me on this.
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Dilip Mevada19 June 2017 at 00:00
Hi,
Thanks for your guidance.
My requirement is whenever any key-value added / updated, my handler will get some notification to reload cache in my application, after reload of cache I will get latest configuration values?
Can u suggest best approach to implement the above scenario?
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Replies
Dilip Mevada19 June 2017 at 22:08
How to read diffence / updated value in hander file?

Consul Command: consul watch -type=keyprefix -prefix="{keyname}" my-prefix-handler.sh

So, whenever any key is updated or added in that {keyname}, How can I will get update result into my handler file?

Please share some sample code for it.

What should be the content of my-prefix-handler.sh file?

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Replies
Anonymous24 July 2017 at 05:17
Hi Ajeet,
I am very new to Consul. I followed all the instruction to install the consul. I am doing it on AWS. But i am getting the error consul command not found. What to do to solve this?
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Thursday 12 May 2016