Linux environment deployment records (1) and linux environment deployment records

Linux environment deployment records (1) and linux environment deployment records

Time settings

View the current system date/time:

date -R

View the system hardware clock:

hwclock  --show

Set the hardware time:

hwclock --set --date="07/18/17 20:55"

Time Synchronization with hardware:

hwclock --hctosys

Time zone settings

tzselect

Select Asia-> China-> Beijing-> YES.

Port/firewall Problems

Check the usage of the specified port. take 80 as an example:

lsof -i:80

Enable the specified port. take 80 as an example:

/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT/etc/init.d/iptables saveservice iptables restart

Disable the specified port. take 80 as an example:

/sbin/iptables -I INPUT -p tcp --dport 80 -j DROP/etc/init.d/iptables saveservice iptables restart

View port status:

/etc/init.d/iptables status

SCP

Scp transmission file (folder ):

scp root@192.168.1.2:/root/backup/1.txt /root/mydirscp -r root@192.168.1.2:/root/backup/dir /root/mydir

Change logon Password

Modify the logon password of the current user:

passwd

Tar command

Decompress the file to the current directory:

tar -zxvf /root/jdk.tar.gz

Compressing directories to files:

tar -zcvf /root/jdk.tar.gz /jdk

Software Installation

View the specified software installation path. Take mysql as an example:

rpm -ql mysql-server

Search for available software, using ssh as the Keyword:

yum search ssh