LinuxQuestions.org

non-Interactive self signed Certificate

Posted 04-05-2020 at 05:08 PM by karanis

openssl req -new -newkey rsa:4096 -days 365 -nodes -x509 \
-subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com" \
-keyout www.example.com.key -out www.example.com.cert

karanis

LQ Newbie

Posted in Uncategorized

Views 187 Comments 0 karanis is offline

SSH : add a host to ~/.ssh/known_hosts

Posted 04-05-2020 at 05:06 PM by karanis

Tags ssh

ssh-keyscan -t rsa -H 192.168.2.124 >> ~/.ssh/known_hosts

karanis

LQ Newbie

Posted in Uncategorized

Views 143 Comments 0 karanis is offline

POWER OFF spinning disk

Posted 04-05-2020 at 05:03 PM by karanis

Tags energy, power off, spinning disk

If you are aware and paranoid on energy saving on spinning disks (which 'as they spin, they die sooner') like me, you may need :

# udisksctl power-off -b /dev/sdX

or

# hdparm -S 1 /dev/sdb

/* for hot plugs */
edit "/etc/udev/rules.d/45-sdX-power.rules" file
ACTION=="add", SUBSYSTEM=="block", KERNEL=="sdX", ATTR{queue/rotational}=="1", RUN+="/path/to/hdparm -S 1 /dev/sdX"...

karanis

LQ Newbie

Posted in Uncategorized

Views 227 Comments 0 karanis is offline

SSH first time login without host cert (yes/no) confirmation

Posted 04-05-2020 at 04:30 PM by karanis

Tags certificate, ssh

THIS IS NOT ADVICED

If you are on a closed network, let`s say 100s of well known hardware, you may need to skip ssh to skip Host Key Check (which is not adviced but in automated scripts in trusted environments, you require this)

$ ssh -o "StrictHostKeyChecking no" user@host

karanis

LQ Newbie

Posted in Uncategorized

Views 247 Comments 0 karanis is offline

Set system time to HW clock (BIOS)

Posted 04-05-2020 at 04:24 PM by karanis
Updated 04-05-2020 at 04:26 PM by karanis (I didn`t mention to execute as root)

Tags ntp, time

# hwclock --systohc --localtime

You update your system time from ntp but sometimes, somehow, something happens and it can not sync to hardware clock as it should be and after reboot, you will need ntp again (with an internet connection).

This is a solution to sync ntp clock to BIOS but be aware that, your BIOS clock will need sync in 24 hours but if you do do not care about seconds, it will carry you along.

If you care about microseconds, hehe

welcome...

karanis

LQ Newbie

Posted in Uncategorized

Views 247 Comments 0 karanis is offline

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