IMPORTANT: Before you begin any disk changes create FULL backup of your server
Show partitions
frisk -l
Modify partitions
fdisk /dev/sdb
m
p, n, p, Enter, Enter, +10G or Enter for full usage, p, w
Update kernel partition
partprobe /dev/sdb
Show partitions
cat /proc/partitions
Available file systems
mkfs + tab, + tab
mkfs.xfs --help
mkfs.btrfs --help
mkfs.xfs -L myfs /dev/sdb1 set label
Info of mounted devices
mount
mount | grep ^/dev
Temporary mounting
mount /dev/sdb1 /mn
mount LABEL=myfs /mnt
Unmount
umount /dev/sdb1
Show devices's UUIDs
blkid
Permanent mount nfs, cifs
rpm -qa | grep nfs-utils
yum install nfs-utils
yum install nfs-utils-lib
yum install nfs4-acl-tools
yum install portmap
rpm -qa | grep cifs-utils
mkdir /backup
vi /etc/fstab
192.168.1.3:/data/exadata /backup nfs rw,hard,tcp,vers=3,bg,nointr,rsize=32768,wsize=32768,actimeo=0 0 0
192.168.1.4:/data/oracle /backup nfs rw,hard,tcp,vers=3,bg,nointr,rsize=32768,wsize=32768,actimeo=0 0 0
192.168.1.4:/data/oracle /backup nfs defaults 0 2
systemctl enable rpcbind
chkconfig rpcbind on
systemctl start rpcbind
systemctl start nfs-server
service rpcbind start
systemctl status rpc-statd.service
mount /backup
mount 192.168.14.4:/data/col1/oracle /backup
mount 192.168.14.3:/data/col1/exadata /backup
mount -a mount all not mounted mount points
Show options of xfs command
xfs_ +tab +tab
Ecrypted partitions, create/connect/disconnect
cryptsetup luksFormat /dev/sdb2
YES
Enter complex password
mkdir /secret
cryptsetup luksOpen /dev/sdb2 secret
cd /dev/mapper
\ls device secret is here
pwd
mkfs.ext4 /dev/mapper/secret
mount /dev/mapper/secret /secret
vi /etc/fstab
/dev/mapper/secret /secret ext4 defaults 1 2
vi /etc/crypttab
/secret /dev/sdb2 none none - passphrase will ask at Linux startup, or enter "yes"
reboot mount -a on't work, because it uses fstab information
umount /secret
cryptsetup luksClose /dev/mapper/secret
journalctl -xb show boot messages
