Linux Network Services - KodeKloud

Linux Network Services.md

Linux Network Services

Our monitoring tool has reported an issue in Stratos Datacenter. One of our app servers has an issue, as its Apache service is not reachable on port 5003 (which is our Apache port). The service itself could be down, the firewall could be at fault, or something else could be causing the issue. Use tools like telnet, netstat, etc. to find and fix the issue. Also make sure Apache is reachable from the jump host without compromising any security settings.

Click on ✔ and Do Task Again

Solution:-

At first Login to stapp01 server or the server that has issue

ssh tony@stapp01

Login as root:

sudo su

Then check httpd

systemctl status httpd

If the status is inactive then find the error by typing

httpd -t

Then go to httpd.conf by typing

vi /etc/httpd/conf/httpd.conf

Uncomment ServerName

ServerName 172.16.238.10:8081 ## SetPort According to Task

Save it by :wq!

Next check which service is blocking your port by typing this command

netstat -anp |grep LISTEN |grep ":8081"

Kill the process

kill -9 450 # 450 pid_number According to Above Command

Then restart httpd

systemctl restart httpd
systemctl status httpd

Next add rules to the iptables And Change 8081 According To Task

sudo iptables -I INPUT -p tcp -m tcp --dport 8081 -j ACCEPT  && sudo iptables-save > /etc/sysconfig/iptables &&  cat /etc/sysconfig/iptables

Now check from Jump Server