Talk About Server

 xfs_repair -L /dev/centos-home

 Error like this:

HDD error: print_req_error: critical medium error, dev sdb, sector xx

Try this one:

1. Reboot use gparted

2. sudo su

3. fdisk -l for lookup error disk, example /dev/mapper/PC--vg-root

4. fsck -f /dev/PC--vg-root (repeat until error gone)

5. e2fsck -fccky /dev/PC--vg-root

6. finish and attach this disk on other fresh install OS

1. Install cygwin
2. search packet: openssh on "full" option search
3. Open cygwin from start windows and run as Administrator
4. type $ ssh-host-config
   
   - Are you sure you want to continue: YES
   - You have the required privileges: YES
   - Overwrite existing /etc/ssh_config: YES
   - Should privilege separation be used: YES
   - Use local account 'sshd': YES
   - Do you want to install 'sshd' as a service: YES
   - name CYGWIN: just press enter - Do you want to use a different name: no
   
   +++ you can skip this ++
    - Create new privileged user account (cyg_server): YES
    - enter password
    - reenter password
    +++ end of skip ++
   
   
5. follow command for running cyg sshd now (on terminal will show you)
6. type $ /bin/mkpasswd.exe -l -u Administrator >> /etc/passwd    (for add user)
7. Reboot windows
8. Finish

Show used memory for apache process

ps aux | grep 'httpd' | awk '{print $6/1024 " MB";}'

And for resume:

ps -ylC httpd --sort:rss | awk '{sum+=$8; ++n} END {print "Tot="sum"("n")";print "Avg="sum"/"n"="sum/n/1024"MB"}'