4u rackmount

storage, priority procurement Rack Server, server procurement principles are:(1) If the 2U server can meet the demand, then use 2U server, usually 2U server maximum support, 2 CPUs, standard 1 CPU, at this time, it is necessary to configure 2 CPUs.If the 2U server does not meet the demand, then the server with 4U, typically, 4U server maximum support 4 CPUs and standard 2 CPUs, when the acquisition of serv

3000activerehashing YesClient-output-buffer-limit Normal 0 0 0Client-output-buffer-limit slave 256MB 64MB 60Client-output-buffer-limit pubsub 32MB 8MB 60Hz 10Aof-rewrite-incremental-fsync Yes[Root@z-dig redis]#Adjust kernel parameters [Root@z-dig redis]# echo >/proc/sys/net/core/somaxconnStart Redis [Root@z-dig redis]#/usr/local/redis/bin/redis-server/usr/local/redis/conf/redis.conf[Root@z-dig redis]# lsof-i:6379COMMAND PID USER FD TYPE DEVICE size/off NODE NAMERedis-ser 20504 Root

*: www (LISTEN)Apache2 2722 www-data 11u IPv4 1198941 0t0 TCP ooxx-vpn: www-> 192.168.0.50: 4068 (ESTABLISHED)Apache2 2723 www-data 3u IPv4 5327 0t0 TCP *: www (LISTEN)Apache2 2725 www-data 3u IPv4 5327 0t0 TCP *: www (LISTEN)Apache2 2725 www-data 11u IPv4 1198939 0t0 TCP ooxx-vpn: www-> 192.168.0.194: 15397 (ESTABLISHED)Apache2 2734 www-data 3u IPv4 5327 0t0 TCP *: www (LISTEN)Apache2 2809 www-data 3u IPv4 5327 0t0 TCP *: www (LISTEN)Apache2 2809 www-data 11u IPv4 1198940 0t0 TCP ooxx-vpn: www

Production environment You may encounter the phenomenon that the log log file generated by the Web server fills up the disk, and the following is a specific solutionInstalling the HTTPD Web Service[email protected] ~]# Yum install httpd-yStart[[email protected] ~]#/etc/init.d/httpd startTest[[email protected] ~]# lsof-i: 80COMMAND PID USER FD TYPE DEVICE size/off NODE NAMEhttpd 1542 Root 4u IPv6 12105 0t0 TCP *:http (LISTEN)httpd 1544 Apache

Problem Introduction: The same problematic code runs well in 4u gcc3.4.6, but fails to run in 5u gcc4.1.2! The simplified problem is as follows: # Include This code has a significant memory overwrite problem, that is, in 64-Bit mode, long is 8 bytes, and its own valid memory is only 4 bytes, which leads to overwrite between values! However, please note that after gcc3.4.6 uses-O2 optimization, the value is correct !!! Find the problem through disass

-ziplist-value 64Hll-sparse-max-bytes 3000activerehashing YesClient-output-buffer-limit Normal 0 0 0Client-output-buffer-limit slave 256MB 64MB 60Client-output-buffer-limit pubsub 32MB 8MB 60Hz 10Aof-rewrite-incremental-fsync Yes[Root@z-dig redis]#Adjust kernel parameters[Root@z-dig redis]# echo >/proc/sys/net/core/somaxconnStart Redis[Root@z-dig redis]#/usr/local/redis/bin/redis-server/usr/local/redis/conf/redis.conf[Root@z-dig redis]# lsof-i:6379COMMAND PID USER FD TYPE DEVICE size/off NODE NA

: 20880 (ESTABLISHED) java 15239 710 285u IPv4 87038933 TCP 10.20.168.13: 43058-> 10.20.172.93: 20880 (ESTABLISHED) java 25755 712 54 4u IPv4 87265535 TCP *: 20880 (LISTEN) java 25755 712 562u IPv4 87265755 TCP 10.20.168.13: 40151-> 10.20.168.16: 20880 (ESTABLISHED) java 25755 712 563u IPv4 87265695 TCP 10.20.168.13: 59947-> 10.20.151.21: 20880 (ESTABLISHED) java 25755 712 564u IPv4 87265696 TCP 10.20.168.13: 47042-> 10.20.142.80: 20880 (ESTABLISHED)

. Modify/ETC/RC.D/INIT.D/HTTPD Join under the #!/bin/bash [Plain] view plaincopy # chkconfig:2345 50 90 # description:activates/deactivates Apache Web Server) 8. Launch Apache [HTML] view Plaincopy Service httpd Start 9. Verify that Apache is starting successfully [Plain] view plaincopy Lsof-i:80 The following output proves Apache boot COMMAND PID USER FD TYPE DEVICE size/off NODE NAME httpd 4158 Root 4u I

, you wowould have to be root to see it all .) tcp 0 0 0.0.0.0: 20880 0.0.0.0: * LISTEN-we use lsof to query the [html] [wei @ vm-cbu-qa-168-13 web-deploy] $ lsof-Pnl + M-i4 | grep 20880 java 15239 710 260u IPv4 87019792 TCP 10.20.168.13: 35822-> 10.20.172.31: 20880 (ESTABLISHED) java 15239 710 285u IPv4 87038933 TCP 10.20.168.13: 43058-> 10.20.172.93: 20880 (ESTABLISHED) java 25755 712 54 4u IPv4 87265535 TCP *: 20880 (LISTEN) java 25755 712 562u IPv

1198938 0t0 TCP ooxx-vpn: www-> 192.168.0.14: 36802 (ESTABLISHED)Proftpd 7191 ftp 0u IPv4 29954 0t0 TCP ooxx-vpn: ftp (LISTEN)Sshd 9720 root 3u IPv4 47070 0t0 TCP *: 8822 (LISTEN)Sshd 9720 root 4u IPv6 47072 0t0 TCP *: 8822 (LISTEN)Svnserve 11217 svn 4u IPv4 1019658 0t0 TCP ooxx-vpn: svn-> 192.168.0.166: 6211 (ESTABLISHED)Svnserve 11350 svn 4u IPv4 1020389 0t0 T

# Open the comment below LoadModule socache_shmcb_module modules/mod_socache_shmcb.so LoadModule ssl_module modules/mod_ssl.so LoadModule slotmem_shm_module modules/mod_slotmem_shm.so Include conf/extra/httpd-ssl.conf #/Usr/local/apache/bin/httpd-t Syntax OK # Httpd-M | grep ssl_mod # Check whether ssl_module is supported Ssl_module (shared) #/Usr/local/apache/bin/apachectl start # Lsof-I: 80 Command pid user fd type device size/OFF NODE NAME Httpd 13445 root

PID USER FD TYPE DEVICE size/off NODE NAME redis-ser 20504 root 4u IPv4 139391 0t0 TCP localhost:6379 (LISTEN) [Root@z-dig redis]# Test [Root@z-dig redis]# ln-s/usr/local/redis/bin/redis-cli/usr/local/sbin/[root@z-dig redis]# redis-cli-h 127.0.0.1-p 63 79-a www.z-dig.com 127.0.0.1:6379> set name Mr.zhou OK 127.0.0.1:6379> get name "Mr.zhou" 127.0.0.1:6379> 127.0. 0.1:6379> help shutdown shutdown [Nosave] [save] summary:synchronous

application in Erlang. Thinking in Erlang, thinking about Erlang, an excellent 30-page introduction to C/C ++/Java/Python developers who have never used functional programming.The authors of practical programming (Pragmatic programmer) and rails Agile programming write the book programming Erlang. This book has two chapters detailing the OTP library.Dave Thomas (of the pragmatic programmer fame) wrote two great articles on his blog about Erlang: Article UN, articleDeux. Of course, there is also

, reducing network complexity and improving server management capabilities and large-scale scalability. Each UCS rack server is equipped with a VIF interface card that provides two Gigabit Ethernet interfaces. using Cisco Network virtualization technology, it provides both management network interfaces and operating system network interfaces. FI is the old version of 6120, which is inconsistent with the new server version. Therefore, you need to set all versions to the latest version, for exampl

multicore CPUs (CPU requires support for virtualization technology and can be turned on for this function);Minimum 5GB disk space is required, 10GB is recommended (mainly for local log and Dump storage);Memory is not less than 2GB.Vcenter 5.5 (including vcenter Single Sign On, vcenter Inventory Service, vcenter serve and other software) is installed on the Windows Server operating system, the requirements for the system are as follows:64-bit operating system for Windows Server 2008 or later;Min

The EATX motherboard is an abbreviation for the extended ATX, primarily for rackmount server systems. It is typically used on servers that are not capable on dual processors and standard ATX motherboards, with 12x13 inches (305mmx330 mm) in size. Eatx the upper part of the motherboard has the same fixed screw position as ATX and is used for high-performance workstations or servers, EATX is generally very rare in the market because it is designed for w

and high-density zones, I am now collectively referred to as "hybrid density zone ". It is easy to achieve high and low density areas. In this way, my cabinets are more comfortable to accommodate equipment. The 2U-4U rack servers can be placed, the 4U blade servers can also be placed, and the minicomputers can also be placed. You only need to control the total distribution capacity of the entire cabinet. T

module and the Gigabit jumper, as the physical link supporting the current backbone Gigabit Network application, when the network needs to be upgraded from 10G to 40g/100g, simply replace the cable rack 10G module and the device jumper on both ends of the pre-connected optical cable to 40g/ 100G modules and jumpers, the deployment of gigabit copper cables between the access switch and the server. 2.4.2 Main wiring Area integrated cabling The main wiring area MDA is the core of the

0 52 ::ffff:192.168.42.128:22 ::ffff:192.168.42.1:43561 ESTABLISHED 6198/2 [root@DB-Server Server]# As shown above, this tool does not feel as concise and clear as nmap. Of course, nmap is not powerful. 3: lsof tool detects open ports [root@DB-Server Server]# service mysql start Starting MySQL......[ OK ] [root@DB-Server Server]# lsof -i:3306 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mysqld 7860 mysql 15u IPv6 44714 TCP *:mysql (LISTEN) [root@DB-Server Server]# service mysql s

-gnu/ld-2.13.so Oldser 29016 ufo del reg 0 0/SYSVa5723213 Oldser 29016 ufo 0u CHR 136,11 0t0 14/dev/pts/11 Oldser 29016 ufo 1u CHR 136, 11 0t0 14/dev/pts/11 Oldser 29016 ufo 2u CHR 136, 11 0t0 14/dev/pts/11 Oldser 29016 ufo 3u IPv4 550310 0t0 TCP localhost: 5555 (LISTEN) Oldser 29016 ufo 4u IPv4 550311 0t0 TCP localhost: 5555-> localhost: 39905 (CLOSE_WAIT) Sometimes a row named anon_inode appears. What does this mean? After I add an epoll to the ser