Home > Article > Operation and Maintenance > How to check whether vsftpd is installed in Linux
Linux method to check whether vsftpd is installed: 1. Execute the "rpm -qa | grep vsftpd" command. If the relevant information about vsftpd is output, it means it has been installed, otherwise it is not installed; 2. Execute "vsftpd -v" command, if the version information of vsftpd is output, it means installation.
#The operating environment of this tutorial: CentOS 6 system, Dell G3 computer.
Check whether vsftpd is installed
Method 1: Use the rpm -qa | grep vsftpd command to Detection
If there is output related information about vsftpd, it means vsftpd has been installed, otherwise it means it has not been installed
Method 2: Use the vsftpd -v command to detect the installation version by viewing it
If the version information of vsftpd is output, it means it is installed, otherwise it means it is not installed
If vsftpd is not installed, you can use yum to install it
Since the vsftpd software depends on some other software and software libraries, it is installed using yum. Relatively easy
1. Configure the yum source
Network: When connected to the Internet, no other configuration is required
Cannot be connected to the Internet: You can configure the local yum source, The Centos system disk can be configured as u pan yum source
2. Install vsftpd
For installing software using yum method, you usually need to use Only root users can install. Installation command: yum -y install vsftpd
[root@localhost ~]# yum -y install vsftpd Loaded plugins: fastestmirror, security Setting up Install Process Determining fastest mirrors * base: centos.ustc.edu.cn * extras: centos.ustc.edu.cn * updates: mirror.bit.edu.cn base | 3.7 kB 00:00 base/primary_db | 4.7 MB 00:01 extras | 3.4 kB 00:00 extras/primary_db | 29 kB 00:00 updates | 3.4 kB 00:00 updates/primary_db | 1.4 MB 00:00 Resolving Dependencies --> Running transaction check ---> Package vsftpd.x86_64 0:2.2.2-24.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================= Package Arch Version Repository Size ============================================================================================================================= Installing: vsftpd x86_64 2.2.2-24.el6 base 156 k Transaction Summary ============================================================================================================================= Install 1 Package(s) Total download size: 156 k Installed size: 340 k Downloading Packages: vsftpd-2.2.2-24.el6.x86_64.rpm | 156 kB 00:00 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : vsftpd-2.2.2-24.el6.x86_64 1/1 Verifying : vsftpd-2.2.2-24.el6.x86_64 1/1 Installed: vsftpd.x86_64 0:2.2.2-24.el6 Complete!
The installation is successful. You can use the sftpd -v command to check the version
3. Default configuration
3.1 Configuration file location
The vsftpd service configuration file is in the /etc/vsftp directory by default, and the core configuration file is vsftpd.conf.
[root@localhost ~]# ll /etc/vsftpd/ total 28 -rw-------. 1 root root 125 May 11 2016 ftpusers -rw-------. 1 root root 361 May 11 2016 user_list -rw-------. 1 root root 4599 May 11 2016 vsftpd.conf -rwxr--r--. 1 root root 338 May 11 2016 vsftpd_conf_migrate.sh -rw-------. 1 root root 4647 Jun 20 20:07 vsftpd.conf.rpmsave [root@localhost ~]#
3.2 Default root directory
The default root directory of vsftp service is /var/ftp. The owner and group of this directory are both root.
[root@localhost ~]# ll -d /var/ftp/ drwxr-xr-x. 3 root root 4096 Jul 1 16:58 /var/ftp/ [root@localhost ~]# ll /var/ftp/ total 4 drwxr-xr-x. 2 root root 4096 May 11 2016 pub [root@localhost ~]#
3.3 Default anonymous user
During the installation process of vsftpd, an ftp user will be created as a proxy user for anonymous users. The ftp user cannot log in to the system.
[root@localhost ~]# id ftp uid=14(ftp) gid=50(ftp) groups=50(ftp) [root@localhost ~]# cat /etc/passwd | grep ftp ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin [root@localhost ~]#
3.4 Default permissions
Under the default configuration, the vsftpd service is allowed Anonymous user access, using the Linux system user as the user source, allowing system users to log in.
Anonymous user permissions: root directory /var/ftp, readable, downloadable, unable to upload files, No new folders can be created, no files can be deleted/renamed
System user permissions: The root directory is the user's home directory, you can jump out of the user's home directory, and the permissions on files are controlled by linux user permissions.
System configuration
After installing vsftpd, you need to make some modifications to the system
ftp_home_dir: Solve non-root user login error: OOPS: child died
[root@localhost vsftpd] setsebool -P ftp_home_dir on [root@localhost vsftpd] setsebool allow_ftpd_full_access on [root@localhost vsftpd]# vim /etc/selinux/config # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - No SELinux policy is loaded. SELINUX=permissive # SELINUXTYPE= can take one of these two values: # targeted - Targeted processes are protected, # mls - Multi Level Security protection. SELINUXTYPE=targeted
Server startup
Centos series can start the server through the service command. Stop, restart1. Start the server
[root@localhost ~]# service vsftpd start Starting vsftpd for vsftpd: [ OK ] [root@localhost ~]#
2. Restart the server
[root@localhost ~]# service vsftpd restart Shutting down vsftpd: [ OK ] Starting vsftpd for vsftpd: [ OK ] [root@localhost ~]#
3. Stop the server
[root@localhost ~]# service vsftpd stop Shutting down vsftpd: [ OK ] [root@localhost ~]#
4. Set auto-start at boot
You can choose to set the vsftpd service to auto-start at boot. You can use the chkconfig command or customize it. Startup script. I use the chkconfig command. chkconfig can set the boot startup for each run level of Linux.[root@localhost ~]# chkconfig | grep vsftpd vsftpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off [root@localhost ~]#4.2 Modify vsftpd startup
[root@localhost ~]# chkconfig --level 35 vsftpd on [root@localhost ~]# chkconfig | grep vsftpd vsftpd 0:off 1:off 2:off 3:on 4:off 5:on 6:off [root@localhost ~]#
vsftpd firewall settings
1. Set the PASV port upper and lower limits
Edit the configuration file: /etc/vsftpd/vsftpd.conf, Append two lines at the end of the file:#设定PASV 端口下限 pasv_min_port=61000 #设定PASV 端口上限 pasv_max_port=62000
2. Release the firewall port
Edit the configuration file: /etc/sysconfig/iptables, add the following configuration to the file:
-A INPUT -m state --state NEW -m tcp -p tcp --dport 20 -j ACCEPT -A OUTPUT -m state --state NEW -m tcp -p tcp --dport 20 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT -A OUTPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 61000:62000 -j ACCEPT -A OUTPUT -m state --state NEW -m tcp -p tcp --dport 61000:62000 -j ACCEPT
3. Restart the service
Restart the vsftpd service and firewall[root@localhost ~]# service vsftpd restart Shutting down vsftpd: [ OK ] Starting vsftpd for vsftpd: [ OK ] [root@localhost ~]# service iptables restart iptables: Setting chains to policy ACCEPT: filter [ OK ] iptables: Flushing firewall rules: [ OK ] iptables: Unloading modules: [ OK ] iptables: Applying firewall rules: [ OK ] [root@localhost ~]#
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