Linux firewall shutdown and turn on, disable SELinux

1) effective after reboot
Open: Chkconfig iptables on
Close: Chkconfig iptables off
2) immediate effect, restart after failure
Open: Service iptables start
OFF: Service iptables stop
It should be explained that for other services under Linux, you can use the above command to perform the open and close operations.
When the firewall is turned on, make the following settings, open the relevant port,
Modify the/etc/sysconfig/iptables file and add the following:
-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 80-j ACCEPT
-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 22-j ACCEPT

There are three ways to set up SELinux.

first, in the graphical interface:
Desktop--> Management--> security level and firewall, set to disable.
Second, in the command mode:
Modify file:/etc/selinux/config, and then reboot the system. Specific modifications as shown:

Third, run the command: Setup, enter the "firewall Configuration", in the SELinux bar, select "Disabled."
Operation Command: Setenforce 0 (no reboot required).

Turn off SELinux protection for the specified service (for example, FTP):
1, use the command: Getsebool Ftpd_disable_trans can view the current state if not on
2, Input command: Setsebool Ftpd_disable_trans 1
Of course, you can add the-p parameter so that you don't have to enter this command every time you boot
Setsebool-p Ftpd_disable_trans 1


Firewall aspect:
First, run the command: Setup, enter the "firewall Configuration", in the security level bar, select "Disabled."
Second, the operation command: Chkconfig--level iptables off.

To open the specified port:
1, run:/sbin/iptables-i input-p tling%2f0%2fcp.html "> cp --dport 80-j ACCEPT Open 80 ports.
2, run:/etc/init.d/iptables Save settings

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Note:

The above process is the key to solving the problem of vsftp as follows,

Oops:cannot Change Directory

Oops:child died

You can use VSFTP when you turn off firewalls and SELinux