CPP_CHEN的专栏

Linux启动过程的剖析能帮助那些想深入学习Linux用户建立一个相关Linux启动过程的清晰概念，进而可以进一步研究Linux接下来是如何工作的 　　Linux启动过程如下：当用户打开PC的电源，BIOS开机自检，按BIOS中设置的启动设备(通常是硬盘)启动，接着启动设备上安装的引导程序lilo或grub开始引导Linux，Linux首先进行内核的引导，接下来执行init程序，i

Linux下高并发socket最大连接数所受的各种限制12/06. 20131、修改用户进程可打开文件数限制在Linux平台上，无论编写客户端程序还是服务端程序，在进行高并发TCP连接处理时，最高的并发数量都要受到系统对用户单一进程同时可打开文件数量的限制(这是因为系统为每个TCP连接都要创建一个socket句柄，每个socket句柄同时也是一个文件句柄)。可使用uli

Setup public authentication for admin (host -> switch passwordless)1)  Run "sshutil importpubkey" command to import public key from host into switchushpwbmscsp100-san05a:admin> sshutil showuse

Steps:1) Generate ssh key pairs on host.2) Logon Cisco MDS switch as "root" or "admin", run    NJRDC9506# config t    Enter configuration commands, one per line.  End with CNTL/Z.    NJRDC95

1 - top --> CPU usage, memory usage, swap memory, Cache, Buffer Size, PID process user commands.2 - vmstat -> Virtual Memory Statistics3 - lsof -> open files list4 - tcpdump-i eth0 -> Packet Ana

1) Gen keyC:\Ken\Perl\Learning>ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/c/Users/chenk6/.ssh/id_rsa):[Enter]Enter passphrase (empty for no

1) netstat2) ifconfig3) lsof4) sysstat/iostat5) top6) grep7) awk/gawk8) sed9) chkconfig10) log rotate11) scp12) rsync13) screen14) tup15) ps 16) ls

1) sudo vim /etc/fsftabEdit the corresponding filesystem entry as below (add "grpquota"):/dev/mapper/lpfs-root  /   ext4    grpquota,errors=remount-ro 0    12) Remount the file systemsudo moun

After created a new smb share directories in Ubuntu and trying to access in Windows, it complains as below :After running the following command, I can access this new share, but I lost the previou

1) Add more disk space to RH VM by vSphere    a. Power off the RH VM    b. Click 'Edit Virtual Machine Setting' in the panel of vSphere     c. 'Hardware -> Hard Disk 1 -> Increase the provisione

After cloning the redhat machine by using vSphere and configure the ip address by using ifconfig, the new machine is not accessible by public network, but can be accessible in the intranet of the VM c

On Linux, if we would like to restart our process when it is down without expect, we can achieve this goal by1) As a service, can be used as 'service start/stop program' etcWrite a script which

We can use :(1) Perl Net::OpenSSH module(2) Perl Expect module(3) Python pexpect modulehttp://www.ibm.com/developerworks/cn/linux/l-cn-pexpect1/index.htmlhttp://pexpect.sourceforge.net/p

sudo apt-get install build-essentialsudo apt-get build-dep apache2wget http://apache.mirrors.pair.com/httpd/httpd-2.4.2.tar.gztar -xzvf httpd-2.4.2.tar.gz && cd httpd-2.4.2sudo ./configure --p

1) Install package management tool "Homebrew" for MAChttp://brew.sh/2) Configure the Terminal's background/foreground and text colors. Default Foreground: 255/255/255Default Backgrou