General/Customer specific

General

Author

Dhirendra Patil

Reviewer

Rukmini

Approver

 

Release date

27/07/2022

Product Version

9.0r15

What’s the Issue? 

User reports that IP Resolution was failing for the URL because the DNS was not configured on the servers

Describe the Issue in Detail

While doing the testing for the service now integration we try to hit the service now URL from the Shipper server for the testing, but it was failing to resolve the URL to IP. 

DNS resolution was failing due to no DNS address being present in /etc/resolv.conf. 

Solution Summary

Solution Steps in Detail

There could be multiple reasons why the DNS resolution is failing.

We should do the following checks:

1. Check If any DNS IP is configured on the server.
   
   # systemd-resolve –status
   or
   # cat /etc/resolv.conf
2.      If DNS IP is present, then try to telnet the IP and check the reachability.
   

vunet@shipper1:~$ telnet 172.24.2.9 53

Trying 172.24.2.9...

Connected to 172.24.2.9.

Escape character is '^]'.

^]

telnet> q

Connection closed.

# sudo systemctl status systemd-resolved.service

To Restart 

# sudo systemctl restart systemd-resolved.service

8. If DNS IP is not present, we need to configure the DNS IP
   
9. 
   
10.      Check if the resolvconf package is presnt. If not install the package.
    
11.      # apt list --installed | grep "resolvconf"
    
12.      Steps to Install the resolvconf package on the server using command or package 
    
13.      Using the command
    
14.       # sudo apt -y install resolvconf
    
15.       Using the Debian package.
    
16.       download the package using the                URL http://ports.ubuntu.com/pool/universe/r/resolvconf/resolvconf_1.79ubuntu10.18.04.3_all.deb and put the package in the server (check for the package as per the OS version 
    
17. 
    
18. Run the below command to install the package
    
19.        # sudo dpkg -i /absolute/path/to/deb/file
    
20.        # sudo apt-get install -f
    
21.        Edit the file /etc/resolvconf/resolv.conf.d/head and add the below the entry and save the file.
    
22.        nameserver <ip_of_nameserver>
    
23.        Run the below command for reloading the configuration.
    
24.        #sudo resolvconf -u
    
25.        Check if the DNS is working properly or not 
    

# systemd-resolve <URL>

Corrective actions if any to avoid in future

1. No