Dziesiate_21
0 21 Fiche michalesq
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Copy ACL between files
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getfacl file1 | setfacl --set-file=- file2
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ACL - setting mask for the file to read only
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setfacl -m m: r file1
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Set the default permissions on dir1 to read, write and execute for the starbuck user; execute only if it is a directory
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setfacl -d -m u: starbuck: rwX dir1
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Using setfacl, change the "other" permissions to none on file1.
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setfacl -m o:- file1
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Remove the default permissions from dir1.
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setfacl --remove-default dir1
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Displays all IPs on the machine
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ip addr
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Displays IP of the particular device
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ip addr show eth0
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Command which shows all hops to get the IP
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treceroute IP
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Command to show all listening ports and established connections
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ss
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Command to show all listening and established connection
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ss -a
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Display all devices in the system
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ls /sys/class/net
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Location of network-scripts
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cd /etc/sysconfig/network-scripts/
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Command to add new network connection and create script in /etc/sysconfig/network-scripts/
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nmcli con add con-name "my connection" autoconnect yes type ethernet ifname eth1
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Command to show network connections
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nmcli dev show
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Command to add network connection with static IP and GW and create script in /etc/sysconfig/network-scripts/
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nmcli con add con-name "my connection" autoconnect yes type ethernet ifname eth1 ip4 10.0.0.0 gw4 10.0.0.1
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File where we can modify if Kernel should look to resolv. conf or /etc/hosts for finding IPs and names
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/etc/nsswitch.conf
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How to set hostname - not persistent?
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hostnamectl set-hostname <hostname>
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How to set hostname - persistent?
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/etc/hostname
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How to add DNS server with nmcli (this will modify /etc/sysconfig/network-scripts/ifcfg-eths0 and resolv. conf)?
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nmcli con mod "System eth0" ipv4. dns 8.8.8.8
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How to display Google IP and domain name?
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getent hosts google.com
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How to up and interface with nmcli?
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nmcli con up eths0
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