4u rackmount

When we use netstat-an, we sometimes see similar output: Udp 0 0 0.0.0.0: 32768 0.0.0.0 :* However, what should I do if I find that/etc/services does not have this port? Is this a hacker program? Is there a way to check which program listens on this port? Use lsof-I: 32768 to see: COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME Rpc. statd 603 root 4u IPv4 953 UDP *: 32768 Rpc. statd 603 root 6u IPv4 956 TCP *: 32768 (LISTEN) It was originally an

0.0.0.0: * LISTEN 1960/sshdTcp 0 0 0.0.0.0: 3306 0.0.0.0: * LISTEN 2263/mysqldTcp 0 0: 22: * LISTEN 1960/sshd# Method 2[Root @ Demon proc] # lsof-I tcp: 22Command pid user fd type device size/OFF NODE NAMESshd 1960 root 3u IPv4 14435 0t0 TCP *: ssh (LISTEN)Sshd 1960 root 4u IPv6 14441 0t0 TCP *: ssh (LISTEN)Ii. Network Configuration1. static IP settings# First, open the NIC configuration file:[Root @ Demon proc] # vim/etc/sysconfig/network-scripts/if

AC MeTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission (s): 11549 Accepted Submission (s): 5123Problem DescriptionIgnatius is doing his homework now. The teacher gives him some articles and asks him to tell how many times each letter appears.It's really easy, isn' t it? So come on and ac me. InputEach article consists of just one line, and all the letters are in lowercase. you just have to count the number of each letter, so do not pay attention to

. Therefore, the Length is parsed and the data is retrieved Based on the Length. In the previous Code, imsi tag does not exist because the TC-COTINUE does not have IMSI data when taking out IMSI. The existing processing is based on sprintf (buf, "%. 2x ", pcap_data [position]) try to determine whether the Tag exists. If so, sprintf (buf," %. 4u ", pcap_data [position. Because the TAG does not exist, it is usually determined that the Tag does not exist

-sTCP: LISTEN This command outputs The Name Of The process/service that is using port 80. Running the following command on port 80 makes it easier to understand this command. It lists the processes/services running on this port. root@localhost:/home/avi# lsof -iTCP:80 -sTCP:LISTENCOMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEapache2 1566 root 5u IPv6 5805 0t0 TCP *:www (LISTEN)apache2 1664 www-data 5u IPv6 5805 0t0 TCP *:www (LISTEN)apache2 1665 www-data 5u IPv6 5805 0t0 TCP *:www (LISTEN)ap

In Linux, how does one know what program a port is running? When we use netstat-an, we sometimes see similar output: www.2cto.com udp 0 0 0.0.0.0: 32768 0.0.0.0: * What should I do if I find that/etc/services does not have the port description? Is this a hacker program? Is there a way to check which program listens on this port? Use lsof-I: 32768 to see: COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME rpc. statd 603 root 4u IPv4 953 UDP *: 32768 rpc. s

The lsof command may be a bit unfamiliar to everyone, because it is rarely used at ordinary times. Today, I made a special remark, hoping to help some O M personnel and recall the knowledge points by myself. Let's talk about the most basic parameters of lsof: Lsof-I: (port) check which processes are accessing the port, such as port 22. [[Email protected] FD] # lsof-I: 22 Command PID user FD type device size/off node name Sshd 567 root 3R IPv4 8956289 0t0 TCP bogon: SSH-> bogon: 51479 (establish

46042 Nagios 4u IPv4 55448 0t0 TCP : 5666 (LISTEN)Nrpe 46042 nagios 5u IPv6 55449 0t0 TCP : 5666 (LISTEN)Nrpe ports and processes are present stating that Nrpe started successfully.Hint: Restart Nrpe can use Killall to kill Nrpe process and then start4. Nagios-server-side configuration.1) Create Host.cfg host file to add monitored hostHere we use lohosthost.cfg as a template to take the first 51 rows as a template for host.cfg[email protected] ~]#Hea

the current Linux server as root through other Linux client tools and observe the changes in the Watch command. Every 1.0s:who Sat 12 12:41:09 2011Stephen Tty1 2011-11-11 17:38 (: 0)Stephen Pts/0 2011-11-11 17:39 (: 0.0)Root PTS/1 2011-11-12 10:01 (192.168.149.1)Root PTS/2 2011-11-12 11:41 (192.168.149.1)Root PTS/3 2011-11-12 12:40 (192.168.149.1)Stephen Pts/4 2011-11-12 12:22 (: 0.0)root PTS/5 2011-11-12 12:41 (192.168.149.1)The user who is highlighted in the last row is the newly logged-on ro

/dhclientUDP 0 0 0.0.0.0:710 0.0.0.0:* 2230/rpc.statdUDP 0 0::: 39834:::* 2230/rpc.statdTo view the occupancy of an end port: lsof-i: Port number[Email protected] ~]# lsof-i:21COMMAND PID USER FD TYPE DEVICE SIZE NODE NAMEPURE-FTPD 2651 Root 4u IPv4 7047 TCP *:ftp (LISTEN)PURE-FTPD 2651 root 5u IPv6 7048 TCP *:ftp (LISTEN)This shows that port 21st is being used by PURE-FTPD and the state is listen4.netstat Output Analysis[Email protected] ~]# netstatA

protected] ~]# Lsof/bin/bashCOMMAND PID USER FD TYPE DEVICE SIZE NODE NAMEBash 24159 root txt REG 8,2 801528 5368780/bin/bashBash 24909 root txt REG 8,2 801528 5368780/bin/bashBash 24941 root txt REG 8,2 801528 5368780/bin/bash[Email protected] ~]#DescriptionExample 3: Recursively view file information for a directoryCommand:Lsof Test/test3Output:[Email protected] ~]# cd/opt/soft/[Email protected] soft]# lsof test/test3COMMAND PID USER FD TYPE DEVICE SIZE NODE NAMEBash 24941 root cwd DIR 8,2 40

;Lsof-n: Do not reverse IP to hostnameLsof-i: Used to show the condition of a processlsof-i [protocol][@hostname |hostaddr][:service|port] 46:ipv4 or IPv6 protocol:tcp or UDP hostname:internet Host name Hostaddr:ipv4 Address Service name in Service:/etc/service (can be more than one) Port: Port number (can be more than one)Example: See what happens with Port 22 now running[[email protected] ~]# Lsof-i: 22COMMAND PID USER FD TYPE DEVICE size/off NODE NAMEsshd 1390 root 3u IPv4 13050 0t0 TCP *:ssh

A tool like Bus hound under Linuxhttp://blog.csdn.net/liuqz2009/article/details/78864610Recommended in Linux you sometimes need to debug USB interface serial message, but no similar to Windows Hound tool, feel more pain, in fact, the Linux kernel provides usbmon This tool, can collect serial information.1. Prepare:Hook up the Debugfs (this can be enabled in the kernel configuration) and load the Usbmon module (if Usbmon is compiled into a module). If Usbmon is compiled into the kernel, the secon

need to map the problem space to the solution space. The process of mapping the overall problem space problem to a solution space solution is called parsing, which can also be called programming.Different series of chips may achieve the same results, but the internal implementation logic may be different, that is, the internal instruction set (which solves the problem on the chip solution) is not the same. Programming with the instructions on the chip is called microcode programming.Three: Why

visits above 1 million PV, MySQL performance will be very low due to disk I/O constraints! To address this constraint, consider the following solutions: Use a raid-0+1 disk array, and be careful not to attempt to use Raid-5,mysql on the RAID-5 disk array not as fast as you expect. 2, CPU for MySQL application, recommend the use of S.M.P. Architecture of the multi-channel symmetric CPU, for example: You can use the two Intel Xeon 3.6GHz CPU, now I recommend using

. Architecture of the multi-channel symmetric CPU, for example: You can use two Intel Xeon 3.6GHz CPU, now I recommend using 4U server to specialize in database server, not only for MySQL. ③ physical memory for a database server that uses MySQL, server memory is not recommended to be less than 2GB, it is recommended to use more than 4GB of physical memory, but memory for the current server can be said to be an overlooked problem, The work encountered

read and write pressure is too large, CPU calculation load, network card load, hard disk random io too highSecondary reason: The performance impact of Read and write Binlog, network transmission latency. C, MySQL database master-Slave synchronization delay solution. Architectural aspects1. The implementation of the business persistence layer adopts the structure of the library, the MySQL service can be expanded in parallel, and the pressure is dispersed.2. Single library read and write separa

PalindromeTime limit:15000MS Memory Limit:65536KB 64bit IO Format:%i64d %i6 4u SubmitStatusDescriptionAndy the smart Computer Science student is attending a algorithms class when the professor asked the students a simple q Uestion, "Can propose an efficient algorithm to find the length of the largest palindrome in a string?"A string is said to being a palindrome if it reads the same both forwards and backwards, for example ' Madam ' is a palindrome

1. View PortWindows under NetstatLinux under NETSTAT-APNWith Netstat found no 8000 ports listed, plus the parameters-apn after the list. In addition, if you want to know the 8000-port situation, you can netstat-apn|grep 80002. Force release port1) Find the occupied portNETSTAT-TLN//View port UsageNetstat-tln | grep 8889//view Port 8000 usage2 to see which process the port is occupied bylsof-i:8889COMMAND PID USER FD TYPE DEVICE size/off NODE NAMEMyServer 17997 Spreadtrum\justin.wu 3u IPv4 593177

of JDBC Connection Pool objects, there is no limit to the use of Cache The size of the Cache and so on. This article does not discuss all kinds of situations, but takes a project case as the background, explores the way to solve such problems, and sums up some best practices for reference by development engineers. Introduction to the project background Project background: Intranet users 500 people, need to do business online at the same time (one hour at noon, 6 o'clock in the evening work).