Log service

1. Modify the log service configuration and restart the log service;

   vim /etc/rsyslog.conf

   Edit the system log configuration to specify the included profile path and rules:

   $IncludeConfig /etc/rsyslog.d/*.conf

2. Create a separate configuration file for haproxy;

   vim /etc/rsyslog.d/haproxy.conf

   Edit the configuration file as follows:

   $ModLoad imudp        # note off
   $UDPServerRun 514    # note off
   
   # Corresponding to the configuration "log 127.0.0.1 local3" in "/ etc/haproxy/haproxy.cfg"
   local3.*    /var/log/haproxy.log
   # If "& ~" is not added, the message file will be written in addition to the log in / var/log/haproxy.log
   &~

3. Configure the main configuration file of "rsyslog" and open the remote log;

   vim /etc/sysconfig/rsyslog

   Modify the configuration as follows:

   SYSLOGD_OPTIONS="-c 2 -r -m 0"
   # -c 2 uses compatibility mode, default is - c 5
   # -r open remote log
   # -m 0 marks the time stamp in minutes. A value of 0 disables this function

4. Restart the HAProxy and log services and view their respective service status:

   service haproxy restart & service haproxy status
   service rsyslog restart & service rsyslog status
   
   # View error log configuration for PHP
   cat /usr/local/php/etc/php.ini | grep error_log

Firewall service

1. Open port (configured according to your own needs):

   firewall-cmd --zone=public --add-port=3306/tcp --permanent
   firewall-cmd --zone=public --add-port=873/tcp --permanent
   firewall-cmd --zone=public --add-port=10002/tcp --permanent
   firewall-cmd --zone=public --add-port=10001/tcp --permanent
   firewall-cmd --zone=public --add-port=80/tcp --permanent
   firewall-cmd --zone=public --add-port=8080/tcp --permanent

2. Restart / reload the firewall service and view its status:

   systemctl restart firewalld.service
   service firewalld restart && service firewalld status
   firewall-cmd --reload

3. Test port:

   telnet ip port

4. Third party firewall
   semanage is recommended here, with its own advantages of Baidu. Installation and configuration:

   # Install the port management tool semanage;
   yum -y install policycoreutils-python
   # Check the opened port;
   semanage port -l|grep http
   # Open port;
   semanage port -a -t http_port_t -p tcp port_number # Open port number, the port number to be opened
   semanage port -d -t http_port_t -p tcp port_number # Close port number, HTTP port is the port group name

Other orders

# To view the pid of a service:
ps -ef | grep ServiceName
# Out of Service:
kill -9 service_pid

# To view the port usage:
lsof -i tcp:80
# List all ports:
netstat -ntlp

# Partition and mount operation
# View current space
df -h
# View available disks
fdisk -l
fdisk /dev/sdb
# Create partition, most operations can default
Command (m for help): m
# Follow the prompts:
# Format after partition
mkfs -t ext4 /dev/sdb1
mkfs -t ext4 /dev/sdb2
# Mount to an existing directory
mount -w /dev/sdb1 /mnt/lnmp
mount -w /dev/sdb2 /mnt/backup
mount -o remount -w /dev/sdb2 /mnt/backup