Hello,
I am running ubuntu 14.04
My server has problems again. I need to manage system files in rescue mode, backup some files, edit /etc/crontab and rc.local files etc.
And WHAT EXACTLY is your problem? What errors do you encounter, where do you run into difficulties? What is your system disk? Show the mounted devices.
Hello Rudic,
CPU is 100% and server is not accessible via ssh in normal boot mode.
The problem started after nfs installation. I received a warning message from authorities emphasizing that nfs usage has some risks as attackers could sniff the system via udp ports. Not sure about that. Company replaced the motherboard in the morning which did not solve the issue. After an eight hours of intervention process they said, server is under attack.
I am still not sure about that so I am planning to edit my settings in rescue mode.
Device Start End Sectors Size Type
/dev/sda1 2048 1048575 1046528 511M EFI System
/dev/sda2 1048576 9435135 8386560 4G Linux RAID
/dev/sda3 9435136 7797250047 7787814912 3.6T Linux RAID
/dev/sda4 7797250048 7814025215 16775168 8G Linux swap
Disk /dev/sdb: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: F60F460A-BE4D-40EB-915B-BAE53BEF4758
Device Start End Sectors Size Type
/dev/sdb1 2048 1048575 1046528 511M EFI System
/dev/sdb2 1048576 9435135 8386560 4G Linux RAID
/dev/sdb3 9435136 7797250047 7787814912 3.6T Linux RAID
/dev/sdb4 7797250048 7814025215 16775168 8G Linux swap
Disk /dev/md3: 7.3 TiB, 7974721421312 bytes, 15575627776 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk /dev/md2: 4 GiB, 4293853184 bytes, 8386432 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Then I run:
Code:
mount /dev/md3 /mnt/
now I can see my files inside mnt. So when I edit related files, I hope it will be auto-edited after reboot in normal mode with one exception.
I do not know how to edit "crontab -e" in this environment.
I had created some rules with that command. Strongly believe that to surf in google will give me an idea.
Last edit:
To stop crontab rules:
Code:
update-rc.d cron remove
Then, I turned server to normal boot
After restart, in command line:
Code:
update-rc.d cron defaults
After I edit some files, I have changed the boot mode. Now system is up&running.
Kind regards
Boris
Last edited by baris35; 06-28-2019 at 07:55 PM..
These 2 Users Gave Thanks to baris35 For This Post:
Thanks for sharing this.
If you know where the crontab file is located - usually under /var/spool/cron/, in your case /mnt/var/spool/cron/ - then you can directly edit it. (That method is not good on a live system because the running cron daemon would not be notified.)
Furthermore, a chroot /mnt crontab -e might work.
This User Gave Thanks to MadeInGermany For This Post:
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06-28-2019
