Linux - commands

Linux - commands:

1. Create a secondary disk on running system
Firstly you need a run scanning:

for i in $(ls /sys/class/scsi_host/); do echo "- - -" > /sys/class/scsi_host/$i/scan; done
for i in $(ls /sys/class/scsi_disk/); do echo "- - -" > /sys/class/scsi_disk/$i/device/rescan; done

lsblk
mkfs.xfs /dev/sdb
ls -l /dev/disk/by-uuid/
blkid /dev/sdb
cp /etc/fstab /etc/fstab.bak
blkid /dev/sdb >> /etc/fstab

vi /etc/fstab

UUID=ef867711-7492-48df-9ffe-0cc1d456533b /export       xfs defaults    0 1

mount -a



2. Incrase existing partition.

for i in $(ls /sys/class/scsi_host/); do echo "- - -" > /sys/class/scsi_host/$i/scan; done
for i in $(ls /sys/class/scsi_disk/); do echo "- - -" > /sys/class/scsi_disk/$i/device/rescan; done
xfs_growfs /dev/sdc1



3. Check version of installed package

rpm -qa |grep php
rpm -e php-gd-5.4.16-46.el7.x86_64 php-ldap-5.4.16-46.el7.x86_64



4. To create a symlink at /usr/bin/bar which references the original file /opt/foo, use:

ln -s /opt/foo /usr/bin/bar

You would need to apply the above command as root (i.e. with sudo).

5. NFS storage


6. Rename network interface

/sbin/ip link set net0 down
/sbin/ip link set net0 name eth0
/sbin/ip link set eth0 up

Mount Linux CIFS share

Mount CIFS with the default local filesystem permissions:
# mkdir /mnt/cifs
# mount -t cifs //server-name/share-name /mnt/cifs -o username=shareuser,password=sharepassword,domain=nixcraft
# mount -t cifs //192.168.101.100/sales /mnt/cifs -o username=shareuser,password=sharepassword,domain=nixcraft

OR
# mount.cifs //192.168.101.100/sales /mnt/cifs -o username=shareuser,password=sharepassword,domain=nixcraft