How can I enable root ssh access in EC2

My requirement is, I need to disable the key authentication and I need to enable root ssh access to my AWS EC2 server.

How can I do that?

Login to your EC2 server with key authentication first
vim /etc/ssh/sshd_config
Disable - PermitRootLogin forced-commands-only and update the same with PermitRootLogin yes
Disable - #PermitEmptyPasswords no and update the same with PasswordAuthentication yes
/etc/init.d/sshd restart

Give root a good password.

Try to login with SSH and given root password.

Jenkins Error:ERROR: Error cloning remote repo 'origin'

In my Jenkins job, I am getting the following error

ERROR: Error cloning remote repo 'origin'
hudson.plugins.git.GitException: Could not init /home/ec2-user/local-jenkins/workspace/vpc_terraform
 at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$5.execute(CliGitAPIImpl.java:772)
 at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$2.execute(CliGitAPIImpl.java:564)
 at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
 at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
 at hudson.remoting.UserRequest.perform(UserRequest.java:212)
 at hudson.remoting.UserRequest.perform(UserRequest.java:54)
 at hudson.remoting.Request$2.run(Request.java:369)
 at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)

I was trying to checkout/download a repository from gitlab. I have given the repo name, credentials and branch.

Solution:

Go to the node where it is going to run (Slave node configuration)
Under Check Tool Locations under Node Properties 
Select Git and input the location of git (which git)
Save and reconnect the slave again.

 

mysql daemon failed to start in amazon linux

mysql daemon failed to start in amazon linux.

I could see that all the configurations and everything is fine and it was working fine.

Solution:

Issue was with there is not free swap memory on the server. You need to add manually a swap file to fix the issue.

Login to the server

# dd if=/dev/zero of=/swapfile1 bs=1024 count=524288
# chown root:root /swapfile1
# chmod 0600 /swapfile1
# mkswap /swapfile1
# swapon /swapfile1
# vi /etc/fstab
Add the following at the last
/swapfile1 none swap sw 0 0
Save the file
$ free -m

Now try to start mysqld service.

No valid instance types found

When I try to launch an instance from a private AMI, I am getting the error

"No valid instance types found" 

The image was created from a snapshot.

Solution : 

Virtualization type by default is Paravirtual, you need to change that type to Hardware-assisted virtualization while creating image from EBS. This will help to fix that error.