virtual machine
What is a virtual machine?
VM: is a virtual computer, the software is a virtual out by a computer.
VM (Virtual Machine) is a computer system simulator , a complete hardware system functions through software emulation,
Run in a completely isolated environment full computer system that can provide the functionality of a physical computer.
How to install Virtual Machine
Installation Tutorial: https://zhinan.sogou.com/guide/d316512415646.htm?ch=zn.wap.it
Install the Linux operating system
Installation Tutorial: https://jingyan.baidu.com/article/c275f6bad6ec38e33d75671e.html
Linux Directory Structure
Linux operating commonly used commands
Common commands
ls: Displays the file or directory
-l: List the file details l (list)
-a ：
List all files and directories in the current directory, including hidden a (all)
mkdir: create directory
-p：
Create a directory, if not the parent directory, create p (parent)
cd: Change directory
touch: create an empty file
echo: Create a file with content.
cat: view the file contents
cp: copy
mv: move or rename
rm: deleting files
-r：
Recursive delete, delete files and subdirectories
-f: Force Delete
find: Search for a file in the file system
wc：
Count the number of rows of text, words, characters
grep：
Find a string in a text file
rmdir: delete empty directories
tree：
Display the directory tree, tree packages to install
pwd: Displays the current directory
ln: create links to files
more, less: page display the contents of a text file
head, tail: display the file header, the end of the content
ctrl + alt + F1: full-screen mode command
Remote connection Linux
I want Windows to copy something to the operating system Linux operating system how to do, or Linux copy something into the operating system Windows operating system how to do , use the tool to remotely connect Linux
Use the command : ifconfig to view ip address
Check whether to activate the virtual network
Installation jdk
Ftp upload to unpack , install tar -zxvf jdk-8u221-linux- x64.tar
Configuration environment variable, open vi / etc / profile add the note at the end of the file is to use the " :" separator
export JAVA_HOME=/home/tina/tools/jdk1.8
export JRE_HOME=$JAVA_HOME/jre
export PATH=$PATH: $JAVA_HOME /bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
Let the files become effective source / etc / profile
Directories and subdirectories to grant root privileges chown root: root -R /home/tina/tools/jdk1.8
View jdk is successfully installed java -version or java or javac
Tomcat installation
1. using ftp tool to archive upload linux the
2. unzip Tomcat command
tar -zxvf the Apache-Tomcat-8.5.43.tar.gz ( archive name )
3. by tomcat in conf under file server.xml configuration
we /home/tomcat/apache-tomcat-8.5.16/conf/server.xml
3. Configure the firewall, open 8080 port
firewall-cmd --zone=public --add-port=8080/tcp --permanent
firewall-cmd --reload
5. Start tomcat find extract the folder in the bin inside stratup.sh
sh startup.sh
Mysql ordinary installed
Download Link: https://pan.baidu.com/s/1qfLS8_KjbzQoMHgSmxYkfg extraction code: VA73
By client tools Xftp upload tar package
Open a terminal extracting tar file: tar -xvf MySQL-5.7.23-1.el7.x86_64.rpm-bundle.tar
Uninstall conflicting RPM components
We install mysql when related components, assemblies if you do not delete this conflict, we are installing unsuccessful.
View postfix and mariadb-libs -related components:
rpm -qa | grep postfix
rpm -qa | grep mariadb
Uninstall postfix and mariadb-libs. Please uninstall the version you run the command appears!
rpm -ev postfix-2.10.1-6.el7.x86_64
rpm -ev mariadb-libs-5.5.52-1.el7.x86_64
Mounting a respective dependency:
yum -y install libaio
yum -y install net-tools
yum -y install perl
Install mysql Components
上面解压操作，得到很多rpm文件。不需要这么多，只需要安装以下四个组件就可以：
rpm -ivh mysql-community-common-5.7.19-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.19-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.19-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.19-1.el7.x86_64.rpm --nodeps
rpm文件版本可能不一样，请到你的目录文件输入ll命令查看再根据对应的文件名修改！
修改MySQL密码
mysql安装完成之后我们是没有设置密码的，但是mysql为我们设置了一个临时的密码，
我们可以查看mysql的日志知道这个临时密码，查看临时密码前确保数据库启动。
启动数据库:
mysql是否启动：service mysqld status
启动mysql： service mysqld start
停止mysql： service mysqld stop
重启mysql： service mysqld restart
查看临时密码： grep password /var/log/mysqld.log
得知临时密码是： #BRm.Mi/s6.i，临时密码登录数据库。
（数据库的密码需要满足以下条件：大小写字母，数字和特殊符号）
登录mysql（命令：mysql -p），输入临时密码
设置新密码： set password = password("Mysql_123");
退出当前登录：quit;
允许远程连接
开启mysql远程访问权限，允许远程连接
mysql -u root -p
use mysql;
update user set host = '%' where user = 'root';
flush privileges;
测试连接mysql
连接时报10060错误，可能是因为没有开启防火墙。在终端输入以下命令关闭防火墙。
firewall-cmd --zone=public --add-port=3306/tcp --permanent;
firewall-cmd --reload;
主机输入你的ip地址 不知道的用ifconfig或者ip addr命令查看
