Programmer Group

IP and subnet mask concepts 1. What is IP ADDRESS internet protocol ADDRESS ## network process address ipv4 internet protocol version 4 ip is composed of 32 01s 11111110.11111110.11111110.11111110 = 254.254.254.254 2. Subnet mask Used to divide the network area The number on the ip corresponding to the non-zero bit of the subnet mask repres ...

1. anaconda3 package download 1.1 windows Download First download through windows, and then transfer to linux server through winscp and other software Official website address: https://www.anaconda.com/products/individual Tsinghua mirror address: https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/ Anaconda corresponds to python vers ...

hadoop startup error ERROR: Cannot set priority of datanode process The cluster was not formatted ./bin/hdfs namenode -format Modify yarn default port After that, it needs to be restarted because it is not hot database Error reporting 1045 [root@test ~]# systemctl stop mariadb ##Close mysql [root@test ~]# mysqld_safe --skip-grant-tables ...

lsof is system management/ security Uber tools. Call this tool lsof a real name, because it means "lists open files". One thing to remember is that in Unix, everything (including network sockets) is a file. Interestingly, lsof is also one of the Linux/Unix commands with the most switches. It has so many switches, and it has many opti ...

Using rpmbuild to package erlang and rabbitmq for service deployment Background description 1. rabbitmq Is based on erlang Developed message queue, itself rabbitmq I don't distinguish between architectures. 2. however erlang It is architecture specific, You need to compile for different architectures 3. rabbitmq Command needs to get erlang Bi ...

1, JDK installation It is recommended to use manual installation instead of using yum to install openjdk; The current installed directory is: /home/jdk/jdk1.8.0_291/bin/java /home/jdk/jdk1.8.0_291/jre/bin/java 2, nexus installation 1. Download nexus Download the installation package official website: https://help.sonatype.com/repomanager3/ ...

1. Software operation and compilation 1.1 software related concepts 1.1.1 ABI ABI : Application Binary Interface Windows is incompatible with Linux ELF(Executable and Linkable Format)PE(Portable Executable) Library level virtualization: Linux: WINEWindows: Cygwin 1.1.2 API API is the Application Programming Interface. API can be implem ...

Linux Walking into Linux system Generally speaking, there are three ways for users to log in Command login ssh login Graphical interface login The highest authority account is root, which can operate for everything! Shut down Shutdown command shutdowm sync Synchronize data from memory to hard disk shutdown Shutdown command, you ca ...

The most commonly used timer on Linux systems is the setitmer timer settimmmer prototype: int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue); which Is timer type, setitimer Three types of timers are supported: ITIMER_REAL: Based on the real time of the system, it sends out SIGALRM Signal. ITIMER_VIRTUAL: -Bas ...

1, Prepare 1. Install ubuntu system No system, play chicken feather!!! Of course, install a system first. I won't write the tutorial. Just search online. Naturally, it's a pile! Here I put a link for my reference, which is very detailed (the author said: "the most detailed in absolute history"), especially for Xiaobai!!! For your ...