Linux service deamon

Linux service deamon 1. There are two types: stand alone, super daemon (the xinetd deamon) www.2cto.com 2. Related directories:/etc/init. d/*: place the startup script./etc/sysconfig/*: Set the initialization environment of each service./etc/xinetd. conf,/etc/xinetd. d/*: super daemon configuration file/etc/*: configuration file of each service/var/lib/*: database generated by each service/var/run /*: PID record of each service Program/etc/services: Set port number 3, stand alone Startup Mode: service httpd start or/etc/init. d/httpd start www.2cto.com 4. super daemon startup method: query whether to start: grep-I 'disable'/etc/xine Td. d/* If/etc/xinetd is displayed. d/rsync: disable = yes, It is not started. If you want to start rsync, vim/etc/xinetd. d/rsync find disable = yes to no, and then restart the service/etc/init. d/xinetd restart or directly chkconfig rsync on, and then restart the xinetd 5 and super daemon configuration files/etc/xinetd. d/bottom and/etc/init. for parameter descriptions in d/xinetd, see other documents. 6. xinetd managed service Firewall/etc/hosts. allow,/etc/hosts. deny, as long as a service is managed by xinetd, or the program of the Service supports the TCP Wrappers function, the firewall settings of the service can be/etc/hosts. {allow, deny. In another way, as long as the software program does not support the TCP Wrappers function, the value of/etc/hosts. {allow, deny} cannot be used. How to determine whether the CP Wrappers function is available: [root @ www ~] # Ldd $ (which sshd httpd)/usr/sbin/sshd: libwrap. so.0 =>/usr/lib64/libwrap. so.0 (0x00002abcbfaed000) libpam. so.0 =>/lib64/libpam. so.0 (0x00002abcbfcf6000 ).... (omitted in the middle ).... /usr/sbin/httpd: libm. so.6 =>/lib64/libm. so.6 (0x00002ad395843000) libpcre. so.0 =>/lib64/libpcre. so.0 (0x00002ad395ac6000 ).... (omitted below ).... # Does the software support libwrap. so the function library, if any, has this function. 7./etc/hosts. allow,/etc/hosts. deny format [root @ www ~] # Vim/etc/hosts. denyrsync: 127.0.0.100 127.0.0.200: deny or [root @ www ~] # Vim/etc/hosts. denyrsync: 127.0.0.100: denyrsync: 127.0.0.200: deny/etc/hosts. allow takes precedence over/etc/hosts. deny. If neither of the two files exists, it means it is accepted without going through the firewall. ALL: indicates that ALL program_name or IP addresses are accepted. For example, ALL: deny LOCAL: indicates the meaning from the LOCAL machine. For example: ALL: LOCAL: allow UNKNOWN: indicates unknown IP address, domain, or service; KNOWN: Indicates resolved IP address, domain, and other information. For example, [root @ www ~] # Vim/etc/hosts. denyrsync: ALL 8, TCP Wrappers special function: when someone else scans my rsync port, I will remember his IP address, TCP Wrappers software is required for future query and authentication. To check whether TCP Wrappers is installed, run 'rpm-q tcp_wrappers. For more information about the usage, see. 9. Check which services are started by the system: netstat-tanlp view all service statuses: service -- status-all view startup service: chkconfig -- list | more open startup service: chkconfig deamon_name on 10. Put your service in chkconfig for management: chkconfig [-- add | -- del] [service name] a. Put the self-built service in/etc/init. d/B. The content of the Service script should be written into: # chkconfig: 35 80 70c, chkconfig -- add service name