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[root@node1 ~]# useradd -u 3945 fred

[root@node1 ~]# echo "iamredhatman" | passwd --stdin fred

Changing password for user fred.

passwd: all authentication tokens updated successfully

system-config-date &

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[root@node1 ~]# nmcli connection show

[root@node1 ~]# nmcli connection add con-name static ifname enp1s0 type ethernet ipv4.addresses 172.25.15.10/24 ipv4.gateway 172.25.15.2 ipv4.dns 172.25.15.2

[root@node1 ~]# nmcli connection modify static ipv4.method manual connection.autoconnect yes

[root@node1 ~]# nmcli connection modify static +ipv4.addresses 10.0.0.5/24

[root@node1 ~]# nmcli connection up static

[root@node1 ~]# nmcli connection show

[root@node1 ~]# hostnamectl set-hostname node1.domain15.example.com

[root@node1 ~]# hostnamectl status

[root@node1 ~]# nmcli connection down static

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[root@node1 ~]# nmcli connection up static

[root@node1 ~]# ip addr show

[root@node1 ~]# reboot

### For checking ###

[root@node1 ~]# ip addr show

[root@node1 ~]# netstat -nr

[root@node1 ~]# cat /etc/resolv.conf

cp /etc/fstab /var/tmp/

/var/tmp/fstab view the owner setfacl -m u:natasha:rw- /var/tmp/fstab setfacl -m u:haryy:--- /var/tmp/fstab

Use getfacl /var/tmp/fstab to view permissions

# cd /home/

# mkdir admins /

# chown .admin admins/

# chmod 770 admins/

# chmod g+s admins/

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[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

[root@node2 ~]# yum install kmod-kvdo vdo

[root@node2 ~]# systemctl enable --now vdo

[root@node2 ~]# systemctl start vdo

[root@node2 ~]# systemctl status vdo

[root@node2 ~]# vdo create --name=vdo1 --device=/dev/vde --vdoLogicalSize=50G

[root@node2 ~]# vdostats --hu

Device Size Used Available Use% Space saving%

/dev/mapper/vdo1 10.0G 4.0G 6.0G 40% N/A

[root@node2 ~]# mkfs.xfs -K /dev/mapper/vdo1

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[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vde 252:64 0 10G 0 disk

└─vdo1 253:4 0 50G 0 vdo

[root@node2 ~]# mkdir /vbread

[root@node2 ~]# blkid

/dev/mapper/vdo1: UUID="1ec7a341-6051-4aed-8a2c-4d2d61833227" BLOCK_SIZE="4096" TYPE="xfs"

[root@node2 ~]# vim /etc/fstab

UUID=1ec7a341-6051-4aed-8a2c-4d2d61833227 /vbread xfs defaults,x-systemd.requires=vdo.service 0 0

[root@node2 ~]# mount /dev/mapper/vdo1 /vbread/

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/vdo1 xfs 50G 390M 50G 1% /vbread

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[root@node1 ~]# cat /usr/share/mime/packages/freedesktop.org.xml | grep ich > /root/lines

[root@node1 ~]# cat /root/lines

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vi /etc/sysconfing/network NETWORKING=yes HOSTNAME=station?.example.com GATEWAY=192.168.0.254

service network restart

2.vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0

ONBOOT=yes

BOOTPROTO=static

IPADDR=X.X.X.X

NETMASK=X.X.X.X

GATEWAY=192.168.0.254

ifdown eth0

ifup eth0

# cd /opt/

# mkdir dir

# find / -user harry -exec cp -rfp {} /opt/dir/ \;

Yum-config-manager --add-repo=http://content.example.com/rhel7.0/x86-64/dvd” is to generate a file vim content.example.com_rhel7.0_x86_64_dvd.repo, Add a line gpgcheck=0

Yumcleanall

Yumrepolist

Almost 4305 packages are right, Wrong Yum Configuration will lead to some following questions cannot be worked out.