Linux

JDK official:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.htmlMy download path:~/downloads/jdk-8u101-linux-x64. tar. gzExtract:cd/usr/libsudotar xzf ~/downloads/jdk-8u101-linux-x64. tar. gzTo configure environment

NFS is divided into client, server. The client wants to access the server side, to write the port from the RPC service.The whole process is divided into:1, server-side RPC service starts first2,NFS service to escalate port to RPC service3,RPC client

Perform tasks periodically1, a certain time in the future to perform a task at, batch2. Periodically run a task crontabExecution result: will be sent to the user by mailMail:1 Mail Service only for this machine2 sending messages between native users/

/etc/passwd user account information./etc/shadow Secure user account information./etc/group group account information./etc/gshadow Security group account information./etc/default/useradd The default value for account creation./etc/skel/ The

# total number of cores = number of physical CPUs x number of cores per physical CPU # Total Logical CPUs = number of physical CPUs x number of cores per physical CPU X number of hyper-threads # View the number of physical CPUs

The philosophical thinking of Linux: Everything is a file (including hardware) Small, single-purpose program: does not require a program to complete complex and powerful tasks. Linking programs to accomplish complex tasks: complete complex

Linux under Iptables configuration detailedIf your iptables basic knowledge is not yet known, it is recommended to take a look first.Start configurationLet's configure a firewall for the filter table.(1) Check the setting of this institution in

Computer systems consist of two major departments of hardware (Hardware) system and Software (software) systemComputer compositionCpuAlu of the arithmetic deviceController CUMemory Rom/ramInput deviceOutput deviceXeon CPU xeone7-4809Single Failture

    According to the World supercomputer TOP500 rankings, Linux not only dominates, it also has the potential to squeeze other opponents into the top 500 list. In the world's 500 fastest computers, the strong open-source operating system Linux

Five I/O models in Unix, unix There are five I/O models in Unix:1. Blocking I/O2. Non-blocking I/O3. I/O multiplexing (select and poll)4. Signal-driven I/O (SIGIO)5. asynchronous I/O (POSIX aio _ series functions) Io requests are divided into two

Sparklyr package -- Implement R and Spark Interfaces1. Introduction to the sparklyr package The sparklyr Package released by Rstudio has the following features: Implement the connection between R and Spark; The sparklyr package provides a

Libvirt installation in CentOS6 source code Libvirt is a free and open-source C function library that supports mainstream virtualization tools in Linux. It aims to provide a convenient and reliable programming interface for various virtualization

Hadoop tutorial (iii) ---- Hadoop Installation This section describes how to install Hadoop. Before that, configure SSH password-free login. Why do I need to configure this? We all know that a Hadoop cluster may have dozens or even thousands of

Py-address, py2ipaddress Https://www.python.org/ Http://www.cnblogs.com/alex3714/category/770733.html Http://edu.51cto.com/lecturer/user_id-3050674-page-1.html Http://edu.csdn.net/lecturer/lecturer_detail? Lecturer_id = 491

Cronolog separates Tomcat catalina. out logs and catalina. out logsTomcat logs are output in catalina. as time passes, the generated log files become larger and larger. The main reason is that some information printed during debugging occupies space,

Centos connection WIFI (1) iw dev view wireless NICs [root @ localhost desktop] # iw devphy #0 Interface wlp4s0 ifindex 3 wdev 0x1 addr 1c: 4b: d6: 91: 83: 0a type managed (2) ip link set *** up enable wireless network adapter [root @ localhost

Use awk to filter strings in text or files When we use a specific command in Unix/Linux to read or edit text from a string or file, we often need to filter out the output to get the desired part. In this case, the regular expression will be

Zabbix-3.0.0 Mount GraphtreeGuideIn Zabbix, the only choice to display images in a centralized manner is screen. Later, zatree solved the screen problem, but the performance was not good enough. Graphtree was developed and open-source by OneOaaS to

Zabbix-3.0.3 monitor MySQL with built-in templatesGuideZabbix is an excellent, open-source, enterprise-level monitoring software. You can monitor many services you want to monitor through secondary development. This article describes how to monitor

Several Methods for centos to access different terminals In centos5 Ctrl + alt + (F1-F6) switch to character interface, ctrl + alt + F7 switch to graphic interface In centos6, centos7 Ctrl + alt + (F2-F6) switch to character interface, ctrl +