Linux: Difference between revisions
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*[[Linux Power Management]] | *[[Linux Power Management]] | ||
==FAQ== | |||
===check if virtual of physicalmachine=== | == FAQ == | ||
=== check if virtual of physicalmachine === | |||
dmidecode -s system-manufacturer | dmidecode -s system-manufacturer | ||
virt-who | virt-who | ||
| |||
=== pam_succeed_if(sudo:auth): requirement "uid >= 1000" not met === | |||
=== Grow (GPT) last partition to max available === | |||
Where '3' is partition number | Where '3' is partition number | ||
parted /dev/sdf resize 3 100% | parted /dev/sdf resize 3 100% | ||
No longer allowed? | No longer allowed? | ||
gdisk | gdisk | ||
===timestamp to human readable=== | === timestamp to human readable === | ||
date -d @1522142497 | date -d @1522142497 | ||
===List hardware=== | |||
*lshw | === List hardware === | ||
*dmidecode | |||
*lsusb | *lshw | ||
*hwinfo | *dmidecode | ||
*lspci | *lsusb | ||
*hwinfo | |||
*lspci | |||
dmidecode -t baseboard | dmidecode -t baseboard | ||
===BLKRRPART: Device or resource busy=== | === BLKRRPART: Device or resource busy === | ||
spend all day or reboot | spend all day or reboot | ||
| |||
=== calling ioclt to re-read partition table: Device or resource busy === | |||
=== | === rescan partition table === | ||
Keep an eye on | |||
cat /proc/partitions | cat /proc/partitions | ||
Partition(s) have been written, but we have been unable to inform the kernel of the change | Partition(s) have been written, but we have been unable to inform the kernel of the change | ||
partprobe | partprobe | ||
kpartx /dev/sdg | kpartx /dev/sdg | ||
partx -uv /dev/sdg | partx -uv /dev/sdg | ||
echo 1 > /sys/block/sde/device/rescan | echo 1 > /sys/block/sde/device/rescan | ||
Only one that seemed to work on (centos7.x) | Only one that seemed to work on (centos7.x) | ||
echo "- - -" > /sys/class/scsi_host/host2/scan | echo "- - -" > /sys/class/scsi_host/host2/scan | ||
blockdev --rereadpt /dev/sdg | blockdev --rereadpt /dev/sdg | ||
maybe | maybe | ||
hdparm -z /dev/sdg | hdparm -z /dev/sdg | ||
===Force reboot=== | === Force reboot === | ||
I found sometimes 'reboot' and 'shutdown' don't work in virtual machines, in that case try: | I found sometimes 'reboot' and 'shutdown' don't work in virtual machines, in that case try: | ||
#sync | #sync | ||
echo s > /proc/sysrq-trigger | echo s > /proc/sysrq-trigger | ||
| Line 105: | Line 121: | ||
echo b > /proc/sysrq-trigger | echo b > /proc/sysrq-trigger | ||
===Mignight commander/dialog strange characters=== | === Mignight commander/dialog strange characters === | ||
Quick fix: | Quick fix: | ||
export LANG=en_US.ISO-8859-1 | export LANG=en_US.ISO-8859-1 | ||
This probleem seems to be related to screen/su - | This probleem seems to be related to screen/su - | ||
===kpartx failing silently=== | === kpartx failing silently === | ||
No output/result when trying to create: | No output/result when trying to create: | ||
kpartx -lv /dev/mapper/foo | kpartx -lv /dev/mapper/foo | ||
this might means the device hasn't been partitioned | this might means the device hasn't been partitioned | ||
No output when trying to delete: | No output when trying to delete: | ||
kpartx -d /dev/mapper/foop1 | kpartx -d /dev/mapper/foop1 | ||
means you should use | means you should use | ||
kpartx -d /dev/mapper/foo | kpartx -d /dev/mapper/foo | ||
[[Category: System Administration]] | ===Create swapfile=== | ||
[[Category: Linux]] | fallocate -l 4G /var/swapfile | ||
mkswap /var/swapfile | |||
swapon -v /var/swapfile | |||
swapon failed: Invalid argument | |||
problably trying to so use it on rhel/centos, use dd instead of fallocate | |||
[[Category:System Administration]] [[Category:Linux]] | |||
Revision as of 10:42, 9 December 2020
Linux is a free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world. Developed under the GNU General Public License , the source code for Linux is freely available to everyone.
Links
Rescue CDs
Checking resources
*inxi *http://www.slashroot.in/linux-system-io-monitoring
show what is doing most disk accesses
iotop glances
IO statistics
iostat vmstat dstat ioping atop
CPU usage etc
top atop htop vtop fio pidstat
Administration
FAQ
check if virtual of physicalmachine
dmidecode -s system-manufacturer virt-who
pam_succeed_if(sudo:auth): requirement "uid >= 1000" not met
Grow (GPT) last partition to max available
Where '3' is partition number
parted /dev/sdf resize 3 100%
No longer allowed?
gdisk
timestamp to human readable
date -d @1522142497
List hardware
- lshw
- dmidecode
- lsusb
- hwinfo
- lspci
dmidecode -t baseboard
BLKRRPART: Device or resource busy
spend all day or reboot
calling ioclt to re-read partition table: Device or resource busy
rescan partition table
Keep an eye on
cat /proc/partitions
Partition(s) have been written, but we have been unable to inform the kernel of the change
partprobe kpartx /dev/sdg partx -uv /dev/sdg echo 1 > /sys/block/sde/device/rescan
Only one that seemed to work on (centos7.x)
echo "- - -" > /sys/class/scsi_host/host2/scan blockdev --rereadpt /dev/sdg
maybe
hdparm -z /dev/sdg
Force reboot
I found sometimes 'reboot' and 'shutdown' don't work in virtual machines, in that case try:
#sync echo s > /proc/sysrq-trigger #optionally umount echo u > /proc/sysrq-trigger #reboot echo b > /proc/sysrq-trigger
Mignight commander/dialog strange characters
Quick fix:
export LANG=en_US.ISO-8859-1
This probleem seems to be related to screen/su -
kpartx failing silently
No output/result when trying to create:
kpartx -lv /dev/mapper/foo
this might means the device hasn't been partitioned
No output when trying to delete:
kpartx -d /dev/mapper/foop1
means you should use
kpartx -d /dev/mapper/foo
Create swapfile
fallocate -l 4G /var/swapfile mkswap /var/swapfile swapon -v /var/swapfile
swapon failed: Invalid argument
problably trying to so use it on rhel/centos, use dd instead of fallocate
