This one has complete steps

https://community.kodekloud.com/t/install-and-configure-haproxy-lbr-failed/6411

Other sources

https://community.kodekloud.com/t/why-install-and-configure-haproxy-lbr-failed/2336/10 https://community.kodekloud.com/t/install-and-configure-haproxy-lbr/2363/18

II. STEPS - SUMMARY

1. Connect via SSH to each App server and take note of the port where the Apache is listening to.

Ensure httpd is running on all App Server.

2. Proceed to LBR Server and install HAproxy through yum only. Enable, start, and then verify status.

3. Modify the HAproxy config file so that HAproxy must server to the default http port - port 80.

Also make sure that the App server are added to the Backend section. Restart HAproxy.

4. Return to the jumphost and curl the ip address of each App server - use the port initially noted.

III. STEPS - BREAKDOWN

1. Connect via SSH to each App server and take note of the port where the Apache is listening to.

Ensure httpd is running on all App Server.

I found that it's much easier to run commands when you switch to root user upon connecting to the

App server/s. So for each one, I just run the three lines and i'll be immediately switched to root

without entering any password.

sshpass -p '******' ssh -o StrictHostKeyChecking=no tony@172.16.238.10 sudo su -

sshpass -p '******' ssh -o StrictHostKeyChecking=no steve@172.16.238.11 sudo su -

sshpass -p '******' ssh -o StrictHostKeyChecking=no banner@172.16.238.12 sudo su -

Note that the following steps are done on EACH APP SERVER - thus all steps from this point onward is

done after connecting via SSH to each App server.

Once connected to the App Server, verify the port that the Apache is listening to.

ps -aux | grep httpd # Not sure if this was helpful but found this in one of the articles in KKC

The port number can be verified through the httpd.conf file.

ls -l /etc/httpd/conf/ cat /etc/httpd/conf/httpd.conf | grep Listen

So far, all three App server have port '8089'

Listen 8089

Verify that httpd is running and enabled.

systemctl status httpd systemctl enable httpd systemctl status httpd

2. Proceed to LBR Server and install HAproxy through yum only. Enable, start, and then verify status.

sshpass -p '******' ssh -o StrictHostKeyChecking=no loki@172.16.238.14 sudo su -

Install HAproxy through YUM then start and enable afterwards.

sudo yum install -y haproxy systemctl start haproxy systemctl enable haproxy systemctl status haproxy

3. Modify the HAproxy config file so that HAproxy must serve to the default http port - port 80.

As always, it's best practice to check first the content of the required file.

Another best practice is to create a backup file in case you mess up the config file.

Since this was a lab, I did not bother to create a backup. But that should always be a must!

ls -l /etc/haproxy/ cd /etc/haproxy/ cat haproxy.cfg

Once config file is checked, modify it according to th requirement.

Make sure that the App server are added to the Backend section. Restart HAproxy.

Please check 'TASK 32 - SF - haproxy.cfg(modified).sh' for further details/

vi haproxy.cfg

# The changes to make are:
#   - 'frontend main *:80' (change to port 80)
#   - add the app servers in the 'backend app' section and include the correct ports.

# The modified sections should look something like this:

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:80
    acl url_static       path_beg       -i /static /images /javascript /stylesheets
    acl url_static       path_end       -i .jpg .gif .png .css .js

    use_backend static          if url_static
    default_backend             app

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
    balance     roundrobin
    server  stapp01 172.16.238.10:8089 check            << Make sure the ports
    server  stapp02 172.16.238.11:8089 check               are added.
    server  stapp03 172.16.238.12:8089 check

server app1 127.0.0.1:5001 check

server app2 127.0.0.1:5002 check

server app3 127.0.0.1:5003 check

server app4 127.0.0.1:5004 check

For the changes to take effect, restart the HAproxy service.

systemctl status haproxy systemctl restart haproxy systemctl enable haproxy systemctl status haproxy

After restarting and verifying HAproxy is up and running, I got stuck at solving the wrong problem.

I kept doing the curl in the LBR server.

I was not also able to access the website on LBR link through the + button on the terminal during my

my first attempt.

I was so focused on this two lines that I didn't notice that I was actually doing the correct steps.

I was just doing the incorrect way of verifying it.

These was the two steps I was doing - which are wrong.

haproxy -db -f /etc/haproxy/haproxy.cfg curl http://localhost:80

After some tries, I decided to take a break and go out to do some errands in the market.

I went back after a few hours and did the lab again but this time check other articles in KKC.

And somehow by some miracle, after two attempts, I was able to open the website through the LBR link.

But before I did that, I first returned to the jumphost and curl the IP addresses.

4. Return to the jumphost and curl the ip address of each App server - use the port initially noted.

curl http://172.16.238.14:80 curl http://172.16.238.10:8089 curl http://172.16.238.11:8089 curl http://172.16.238.12:8089

All of this curl commands shuld return this output:

thor@jump_host /$ curl http://172.16.238.14:80 Welcome to xFusionCorp Industries !

thor@jump_host /$ curl http://172.16.238.10:8089 Welcome to xFusionCorp Industries !

thor@jump_host /$ curl http://172.16.238.11:8089 Welcome to xFusionCorp Industries !

thor@jump_host /$ curl http://172.16.238.12:8089 Welcome to xFusionCorp Industries !

############################################################################################################

####### ### ### ####### ####### ######### ####### ####### ### ###

#### ### ### #### #### #### #### ######### #### #### #### #### ###

### ### ### ### ### ### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ###

####### ### ### ### ### ######## ####### ####### ### ### ####### ### ### ### ### ######## ####### ####### ### ###

### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ### ### ### ###

######### ######### #### #### #### #### ######### ######### ######### ### ### ####### ####### ####### ####### ######### ####### ####### ### ###

############################################################################################################

######### ##### ### ### ######### ######## ### ## ######### ####### ### ### ######### ######### ### ###

### ### ### ### ### ### ### ### ###

######## ### ### ### ### ######## ### ### ### ### ######## ### ### ### ### ######## ### ### ### ###

######### ### ### ### ### ### ### ###

######### ### ### ### ### ### ###

### ### ### ######### ######### ######### ###

### ### ### ######### ######### ######## ###

############################################################################################################

Other sources

1. Connect via SSH to each App server and take note of the port where the Apache is listening to.

Ensure httpd is running on all App Server.

2. Proceed to LBR Server and install HAproxy through yum only. Enable, start, and then verify status.

3. Modify the HAproxy config file so that HAproxy must server to the default http port - port 80.

Also make sure that the App server are added to the Backend section. Restart HAproxy.

4. Return to the jumphost and curl the ip address of each App server - use the port initially noted.

1. Connect via SSH to each App server and take note of the port where the Apache is listening to.

Ensure httpd is running on all App Server.

I found that it's much easier to run commands when you switch to root user upon connecting to the

App server/s. So for each one, I just run the three lines and i'll be immediately switched to root

without entering any password.

Note that the following steps are done on EACH APP SERVER - thus all steps from this point onward is

done after connecting via SSH to each App server.

Once connected to the App Server, verify the port that the Apache is listening to.

The port number can be verified through the httpd.conf file.

So far, all three App server have port '8089'

Verify that httpd is running and enabled.

2. Proceed to LBR Server and install HAproxy through yum only. Enable, start, and then verify status.

Install HAproxy through YUM then start and enable afterwards.

3. Modify the HAproxy config file so that HAproxy must serve to the default http port - port 80.

As always, it's best practice to check first the content of the required file.

Another best practice is to create a backup file in case you mess up the config file.

Since this was a lab, I did not bother to create a backup. But that should always be a must!

Once config file is checked, modify it according to th requirement.

Make sure that the App server are added to the Backend section. Restart HAproxy.

Please check 'TASK 32 - SF - haproxy.cfg(modified).sh' for further details/

server app1 127.0.0.1:5001 check

server app2 127.0.0.1:5002 check

server app3 127.0.0.1:5003 check

server app4 127.0.0.1:5004 check

For the changes to take effect, restart the HAproxy service.

After restarting and verifying HAproxy is up and running, I got stuck at solving the wrong problem.

I kept doing the curl in the LBR server.

I was not also able to access the website on LBR link through the + button on the terminal during my

my first attempt.

I was so focused on this two lines that I didn't notice that I was actually doing the correct steps.

I was just doing the incorrect way of verifying it.

These was the two steps I was doing - which are wrong.

After some tries, I decided to take a break and go out to do some errands in the market.

I went back after a few hours and did the lab again but this time check other articles in KKC.

And somehow by some miracle, after two attempts, I was able to open the website through the LBR link.

But before I did that, I first returned to the jumphost and curl the IP addresses.

4. Return to the jumphost and curl the ip address of each App server - use the port initially noted.

All of this curl commands shuld return this output:

#### ### ### #### #### #### #### ######### #### #### #### #### ###​

### ### ### ### ### ### ### ### ### ### ### ### ###​

### ### ### ### ### ### ### ###​

### ### ### ### ### ### ### ###​

### ### ### ### ### ### ### ### ### ### ###​

### ### ### ### ### ### ### ### ###​

### ### ### ### ### ### ### ### ###​

######### ### ### ### ### ### ### ###​

######### ### ### ### ### ### ###​

### ### ### ######### ######### ######### ###​

### ### ### ######### ######### ######## ###​

#### ### ### #### #### #### #### ######### #### #### #### #### ###

### ### ### ### ### ### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ### ###

### ### ### ### ### ### ### ### ###

######### ### ### ### ### ### ### ###

######### ### ### ### ### ### ###

### ### ### ######### ######### ######### ###

### ### ### ######### ######### ######## ###