DHCP Configuration Tutorial in CentOS7 Environment

yum -y install dhcp #First install dhcp, the system does not install it by default cd /etc/dhcp #Enter the dhcp directory ls
less dhcpd.conf #Take a look at the dhcp configuration file, most of which are empty cd /usr/share/doc/dhcp-4.2.5 #Reference template for dhcp configuration file less dhcpd.conf.example #View the reference template for the configuration file cp /usr/share/doc/dhcpd.conf.example /etc/dhcp/dhcpd.conf #Copy the template file to the configuration file vim /etc/dhcp/dhcpd.conf #Enter the editing of the dhcp configuration file

default-lease-time 21600; #Default lease is 6 hours, in seconds max-lease-time 43200; #Maximum lease is 12 hours, in seconds option domain-name "……"; #Specify the default domain name option domain-name-servers ……; #Specify the DNS server address ddns-update-style none; #Disable DNS dynamic update

subnet 192.168.80.0 netmask 255.255.255.0 { #First declare the DHCP server segment and subnet mask range 192.168.80.10 192.168.80.20; #Set the IP address pool option routers 192.168.80.254; #Specify the default gateway}
subnet 192.168.1.0 netmask 255.255.255.0 { #Secondly declare other network segments and subnets range 192.168.1.100 192.168.1.200; #Set the IP address pool option routers 192.168.1.254; #Specify the default gateway default-lease-time 45600  
  option domain-name-servers 8.8.8.8;
}

host hostname { #Specify the name of the client that needs to be assigned a fixed IP address hardware ethernet xx:xx:xx:xx:xx:xx:xx; #Specify the MAC address of the host fixed-address 192.168.80.100; #Specify the IP address reserved for the host}

systemctl start dhcpd #Start dhcp servicesystemctl stop firewalld #Turn off firewallsentenforce 0 #Turn off firewallnetstat -naup | grep 67 #Check if the service is startedtail -f /var/log/messages #If the startup fails, you can check the log file to find the error

ym install -y vsftpd
or rpm -ivh vsftpd-3.0.2-25.el7.x86_64.rpm

cd /etc/vsftpd/

cp vsftpd.conf vsftpd.conf.bak
or cp vsftpd.conf {,.bak}

vim /etc/vsftpd/vsftpd.conf
anonymous_enable=YES enables anonymous user access. By default, write_enable=YES is enabled to open the server's write permission (must be enabled if uploading is required). Anon_umask=022 is enabled by default. Set the permission mask (reverse mask) for data uploaded by anonymous users.
anon_upload_enable=YES allows anonymous users to upload files. Commented by default, need to be uncommented anon_mkdir_write_enable=YES Allow anonymous users to create (upload) directories. Commented by default, need to be uncommented anon_other_write_enable =YES allows deletion, renaming, overwriting and other operations. It is necessary to set the maximum permissions for the pub subdirectory under the root directory of anonymous ftp so that anonymous users can upload data. chmod 777 /var/ftp/pub/ The root directory of ftp anonymous users # Enable the service, disable the firewall and enhanced security features systemctl start vsftpd Enable FTP service systemctl stop firewalld Disable the firewall setenforce 0 Disable enhanced security features

Establish an ftp connection ftp 192.168.80.10 anonymous access, user name ftp, passwd is empty, just press Enter to complete the login ftp> pwd anonymous access ftp root directory is the Linux system /var/ftp/directory ftp> ls View the current directory ftp> cd pub Switch to the pub directory ftp> get file name Download the file to the current Windows local directory ftp> put file name Upload the file to the ftp directory ftp> quit Exit

vim /etc/vsftpd/vsftpd.conf Modify the configuration file local_enable=Yes Enable local users anonymous_enable=NO Disable anonymous user access write_enable=YES Open the server's write permission (must be enabled if uploading)
local_umask=077 can be set to allow only the host user to have permissions for uploaded files (reverse mask)
chroot_local_user=YES restricts access to the user's home directory allow_writeable_chroot=YES allows restricted user home directories to have write permissions systemctl restart vsftpd restart the service or type ftp 192.168.80.10 in the Windows network

anon_root=/var/www/html anon root for anonymous users local_root=/var/www/html local root for system users

vim /etc/vsftpd/user_list/
Add zhangsan user zhangsan at the end

vim /etc/vsftpd/vsftpd.confuserlist_enable=YES Enable the user_list user list file userlist_deny=NO Set up a whitelist and only allow users of the user_list user list file to access. The default is YES, which is blacklisted and disabled.