Linux System Administration and Configuration. Related Yo. Linux Configuration and Admin Tutorials. The Linux boot process. Force Install A Perl Module Tutorial In Vb6' title='Force Install A Perl Module Tutorial In Vb6' />Quotas Assign disk resource limits to users or groups. Managing groups and user security Linux Networking tutorial. DHCP Server tutorial. NIS Server Client configuration tutorial. Configuring an internet web server. Apache, DNS, FTP. Internet Server Security. System optimization System re configuration Commands used to re configure video, keyboard, mouse, datetime, sound card, NIC, Printer. Installing a new kernel RPMYo. PHPv522 configuration considerations php. Win3kiis6 cgi. forceredirect 0 You MUST set this its commented out by default two new settings are included. Linux Tutorials Index. Monitoring the system Basic command line pstree Processes and parent child relationshipstop Show top processesmpstat Report processors related statistics. Example mpstat AUbuntu install apt get install sysstatdstat generate system resource statistics report. Examples dstat a, dstat fUbuntu install apt get install dstatiostat Report CPU statistics and inputoutput statistics for devices and partitions. Report virtual memory statisticsstat display file or file system status. Example stat f devsda. NFS statisticsUbuntu install apt get install nfs common. Display Linux kernel version in use. Display Red Hat Linux Release. Tell how long the system has been running. Also number of users and systems load average. Show who is logged on and what they are doing. List all currently loaded kernel modules. Same as cat procmodulessbinrunlevel. Displays the systems current runlevel. Displayschanges the systems node name. Must also manually change hostname setting in etcsysconfignetwork. Command will change entry in etchostsservice. Youve got problems, Ive got advice. This advice isnt sugarcoatedin fact, its sugarfree, and may even be a little bitter. Welcome to Tough Love. Force Install A Perl Module Tutorial' title='Force Install A Perl Module Tutorial' />Red HatFedora command to display status of system services. Example service status all. Help service help. Also see ntpstat. GUIGraphical gnome system monitor. Operating system monitor and usage graphing. Graphical system monitor. Additional RPM package gkrellmps. D load meter. Very cool 3 D graphics. Operating system monitor load, memory, swap, net, disk,. List of tools. Process Management. Force Install A Perl Module Tutorial' title='Force Install A Perl Module Tutorial' />Processes execute within their own process environment, they have their own memory, current working directory, priority, process ID, parent process ID and the file access privileges of the user ID under which they execute. The basic Linux monitoring commands such as pstree and ps auxw. Sometimes a process must be terminated. To terminate a process. Identify the process. OR. ps auxw. OR. Kill the process. This will perform an orderly shutdown of the process. If it hangs give a stronger signal with. This method is not as sanitary and thus less preferred. A signal may be given to the process. The program must be programmed to handle the given signal. See usrincludebitssignum. For example, to restart a process after updating its configuration file. Force Install A Perl Module Tutorial' title='Force Install A Perl Module Tutorial' />HUP lt process id number. In the previous example, the HUP signal was sent to the process. The software was written to trap for the signal so that it could respond. If the software command is not written to respond to a particular. Identify all known signals fuser l. Process Monitoring and Management GUI Tools xosview Oldie but goodie. Su. SE. QPS See below. Also see the GUI tool QPS. Handles MOSIX cluster. This tool is outstanding for monitoring, adjusting nice values priorities. RPM available from this site. It is so simple to use, no instructions are necessary. It can monitor a program to make sure it isnt doing something bad. It is also reverse engineer what applications are doing and the environments. I love this toolNote The RPM provided was compiled for Red. Hat 7. x. For Red. Hat 8. 0 one must. QT library RPMs to satisfy dependencies. Xt 2. 3. 1 8. i. Then install qps rpm ivh qps 1. Note Fedora Core 3 rpm ivh qt. These older RH 8. AMD6. 4 Fedora Core 3 x. OS system. Configuring QPS to run applications against a process Select Command Edit Commands. Add. Description GDB. Command Line xterm T GDB C e gdb d directory where source code is located pidp. Description gdb. Command Line xterm T gdb c p e gdb procpexe p As issued in RPM. Description strace. Command Line xterm T strace c p e sh c strace f pp sleep 1. Try it with the process qps itself. Show output written by process. T strace c p e sh c strace f q e tracewrite pp sleep 1. Description truss Solaris command. Command Line xterm T truss C p e sh c truss f p p sleep 1. Process Priority Control. Multi tasking operating systems executes processes in a time slice fashion sharing the processing resources base on their current privilege. Privileges are not constant and elevate if they have not received an execution allocation in the processor after a given time. This is to ensure that all processes get executed regardless of priority although a process can get squeezed out of the time allocation alltogether if the system is overloaded. Higher priority processes may get more time allocated on the processor than a lower priority process but it is likely that the lower process will get some processor allocation. Many system process which manage the system environment execute at an elevated priority in order to guarentee that they get executed. User processes can have their priority elevated using the nice command. Nice values have a range from 2. Beware that if the priority is elevated higer than a system process, the behavior of the system may be compromised. Modify process scheduling priority. Lower scheduling priority runs slower and less likely to slow you down. Default for nice n is 1. Show default for any process nice executable. Shows nice value to be used if run. IPCs Semaphores, Shared Memory and Queues. Note that some processes may use Linux Inter. Process Communication or IPC. Identify the semaphores ipcsipcs q List share queues. Shared memory. ipcs s List Semaphores. Remove the semaphores ipcrm s lt ipcs id. Example If you are running Apache, you may see the following. DIR ipcs m Shared Memory Segments key shmid owner perms bytes nattch status 0x. Processes attached to open files or open network ports. The command lsof. List processes attached to a given file lsof filename. DIR lsof varlogmailmanqrunner. REG 3,5 6. 57 4. REG 3,5 6. REG 3,5 6. 57 4. REG 3,5 6. REG 3,5 6. 57 4. REG 3,5 6. REG 3,5 6. 57 4. REG 3,5 6. The process attached to an open file can be killed using the command. List all open files on system lsofLong list. List all files opened by user lsof u user id. The commands netstat punta and socklist will list open network connections. Use the command lsof i TCP port number to see the processes attached to the port. Example. rootnode DIR lsof i TCP 3. COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME. IPv. 4 7. 56. 00. TCP ldap LISTEN. IPv. TCP ldap LISTEN. IPv. TCP ldap LISTEN. IPv. TCP ldap LISTEN. IPv. TCP ldap LISTEN. This shows that the command slapd running under user id ldap. Restricting user resources ulimit bash shell command. Shell and process resources may be controlled and reported using the. Display the limits of a shell using the bash command. Cara Download Majalah Dewasa Gratis there. Limits can be set for the number of open files and. View file size limits ulimit f. See limits assigned in etcsecurity discussed below.