文章目录
linux基本项目环境搭建
java环境搭建
获取java源码包
将本地jdk-8u144-linux-x64.tar.gz通过xftp上传到ECS的指定目录下（一般为/usr/local/java）
解压
tar zxvf jdk-8u144-linux-x64.tar.gz
z：调用gzip命令在文件打包过程中压缩/解压文件
x：打包文档中还原出文件
v：显示命令执行过程
f：指定备份文件
配置环境变量
vim /etc/profile
在文件末尾加上
#set java environment
JAVA_HOME=/usr/local/java/jdk1.8.0_144
CLASSPATH=.:$JAVA_HOME/lib.tools.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH
使配置文件生效
source /etc/profile
验证
[root@iZwz9938t1plpkhn7ajjkrZ java]# java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
nginx安装
下载（java也可用此方法下载）
[root@hostname nginx]# ll
total 0
[root@hostname nginx]# wget http://nginx.org/download/nginx-1.12.2.tar.gz
--2019-03-04 21:51:00-- http://nginx.org/download/nginx-1.12.2.tar.gz
Resolving nginx.org (nginx.org)... 95.211.80.227, 62.210.92.35, 2001:1af8:4060:a004:21::e3
Connecting to nginx.org (nginx.org)|95.211.80.227|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 981687 (959K) [application/octet-stream]
Saving to: ‘nginx-1.12.2.tar.gz’
100%[========================================================================================================================>] 981,687 151KB/s in 6.5s
2019-03-04 21:51:07 (148 KB/s) - ‘nginx-1.12.2.tar.gz’ saved [981687/981687]
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx]# ll
total 960
-rw-r--r-- 1 root root 981687 Oct 17 2017 nginx-1.12.2.tar.gz
解压
tar -zxvf nginx-1.12.2.tar.gz
[root@hostname nginx-1.12.2]# ll
total 724
drwxr-xr-x 6 1001 1001 4096 Mar 4 21:54 auto
-rw-r--r-- 1 1001 1001 278202 Oct 17 2017 CHANGES
-rw-r--r-- 1 1001 1001 423948 Oct 17 2017 CHANGES.ru
drwxr-xr-x 2 1001 1001 4096 Mar 4 21:54 conf
-rwxr-xr-x 1 1001 1001 2481 Oct 17 2017 configure
drwxr-xr-x 4 1001 1001 4096 Mar 4 21:54 contrib
drwxr-xr-x 2 1001 1001 4096 Mar 4 21:54 html
-rw-r--r-- 1 1001 1001 1397 Oct 17 2017 LICENSE
drwxr-xr-x 2 1001 1001 4096 Mar 4 21:54 man
-rw-r--r-- 1 1001 1001 49 Oct 17 2017 README
drwxr-xr-x 9 1001 1001 4096 Mar 4 21:54 src
配置(configure)
引用 http://blog.sina.com.cn/s/blog_406127500101dsmy.html
源码的安装一般由3个步骤组成：配置(configure)、编译(make)、安装(make install)。
Configure是一个可执行脚本，它有很多选项，在待安装的源码路径下使用命令./configure –help输出详细的选项列表。
其中–prefix选项是配置安装的路径，如果不配置该选项，安装后可执行文件默认放在/usr /local/bin，库文件默认放在/usr/local/lib，配置文件默认放在/usr/local/etc，其它的资源文件放在/usr /local/share，比较凌乱。
如果配置–prefix，如：
./configure --prefix=/usr/local/test
可以把所有资源文件放在/usr/local/test的路径中，不会杂乱。
用了—prefix选项的另一个好处是卸载软件或移植软件。当某个安装的软件不再需要时，只须简单的删除该安装目录，就可以把软件卸载得干干净净；移植软件只需拷贝整个目录到另外一个机器即可（相同的操作系统）。
当然要卸载程序，也可以在原来的make目录下用一次make uninstall，但前提是make文件指定过uninstall。
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]# ./configure --prefix=/usr/local/nginx/
checking for OS
+ Linux 3.10.0-693.2.2.el7.x86_64 x86_64
checking for C compiler ... found
+ using GNU C compiler
+ gcc version: 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC)
...
checking for PCRE library in /usr/include/pcre/ ... not found
checking for PCRE library in /usr/pkg/ ... not found
checking for PCRE library in /opt/local/ ... not found
./configure: error: the HTTP rewrite module requires the PCRE library.
You can either disable the module by using --without-http_rewrite_module
option, or install the PCRE library into the system, or build the PCRE library
statically from the source with nginx by using --with-pcre=<path> option.
缺少PCRE library，正则表达式库，nginx中location匹配要用到的一种。
安装 正则表达式库
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]# yum install pcre
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/7): epel/x86_64/group_gz | 88 kB 00:00:00
(2/7): base/7/x86_64/group_gz | 166 kB 00:00:00
(3/7): epel/x86_64/updateinfo | 960 kB 00:00:00
(4/7): base/7/x86_64/primary_db | 6.0 MB 00:00:00
(5/7): extras/7/x86_64/primary_db | 180 kB 00:00:00
(6/7): updates/7/x86_64/primary_db | 2.4 MB 00:00:00
(7/7): epel/x86_64/primary_db | 6.6 MB 00:00:00
Determining fastest mirrors
Package pcre-8.32-17.el7.x86_64 already installed and latest version
Nothing to do
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]# yum install pcre-dev
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
No package pcre-dev available.
Error: Nothing to do
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]#
可以安装的标志
Configuration summary
+ using system PCRE library
+ OpenSSL library is not used
+ using system zlib library
nginx path prefix: "/usr/local/nginx/"
nginx binary file: "/usr/local/nginx//sbin/nginx"
nginx modules path: "/usr/local/nginx//modules"
nginx configuration prefix: "/usr/local/nginx//conf"
nginx configuration file: "/usr/local/nginx//conf/nginx.conf"
nginx pid file: "/usr/local/nginx//logs/nginx.pid"
nginx error log file: "/usr/local/nginx//logs/error.log"
nginx http access log file: "/usr/local/nginx//logs/access.log"
nginx http client request body temporary files: "client_body_temp"
nginx http proxy temporary files: "proxy_temp"
nginx http fastcgi temporary files: "fastcgi_temp"
nginx http uwsgi temporary files: "uwsgi_temp"
nginx http scgi temporary files: "scgi_temp"
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]#
编译和安装
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]# make && make install
make -f objs/Makefile
make[1]: Entering directory `/usr/local/nginx/nginx-1.12.2'
cc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs \
-o objs/src/core/nginx.o \
src/core/nginx.c
cc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs \
-o objs/src/core/ngx_log.o \
src/core/ngx_log.c
cc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs \
-o objs/src/core/ngx_palloc.o \
src/core/ngx_palloc.c
cc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs \
-o objs/src/core/ngx_array.o \
src/core/ngx_array.c
.
.
.
cp conf/scgi_params \
'/usr/local/nginx//conf/scgi_params.default'
test -f '/usr/local/nginx//conf/nginx.conf' \
|| cp conf/nginx.conf '/usr/local/nginx//conf/nginx.conf'
cp conf/nginx.conf '/usr/local/nginx//conf/nginx.conf.default'
test -d '/usr/local/nginx//logs' \
|| mkdir -p '/usr/local/nginx//logs'
test -d '/usr/local/nginx//logs' \
|| mkdir -p '/usr/local/nginx//logs'
test -d '/usr/local/nginx//html' \
|| cp -R html '/usr/local/nginx/'
test -d '/usr/local/nginx//logs' \
|| mkdir -p '/usr/local/nginx//logs'
make[1]: Leaving directory `/usr/local/nginx/nginx-1.12.2'
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx-1.12.2]# ll
启动
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx]# ./sbin/nginx
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx]# ps -aux | grep nginx
root 26422 0.0 0.0 20492 612 ? Ss 09:08 0:00 nginx: master process ./sbin/nginx
nobody 26423 0.0 0.0 20936 1336 ? S 09:08 0:00 nginx: worker process
root 26431 0.0 0.0 112660 964 pts/0 S+ 09:08 0:00 grep --color=auto nginx
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx]# netstat -ant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 172.18.45.156:39316 100.100.30.25:80 ESTABLISHED
tcp 0 52 172.18.45.156:22 59.68.29.48:48314 ESTABLISHED
[root@iZwz9ezkmfgg9sw1ujpt5zZ nginx]#
php安装
下载
下载页面：http://cn2.php.net/get/php-7.1.6.tar.gz/from/a/mirror
下载连接：http://cn2.php.net/get/php-7.1.6.tar.gz/from/this/mirror
解压
tar -zxvf php-7.1.6.tar.gz
[root@iZwz9ezkmfgg9sw1ujpt5zZ php-7.1.6]# ll
total 4276
-rw-rw-r-- 1 1000 1000 82506 Jun 7 2017 acinclude.m4
-rw-rw-r-- 1 1000 1000 312883 Jun 7 2017 aclocal.m4
drwxrwxr-x 2 1000 1000 4096 Jun 7 2017 appveyor
drwxrwxr-x 2 1000 1000 4096 Jun 7 2017 build
-rwxrwxr-x 1 1000 1000 772 Jun 7 2017 buildconf
-rw-rw-r-- 1 1000 1000 334 Jun 7 2017 buildconf.bat
-rw-rw-r-- 1 1000 1000 11982 Jun 7 2017 CODING_STANDARDS
-rw-rw-r-- 1 1000 1000 42938 Jun 7 2017 config.guess
-rw-rw-r-- 1 1000 1000 35987 Jun 7 2017 config.sub
-rwxrwxr-x 1 1000 1000 2759190 Jun 7 2017 configure
-rw-rw-r-- 1 1000 1000 46774 Jun 7 2017 configure.in
-rw-rw-r-- 1 1000 1000 3163 Jun 7 2017 CONTRIBUTING.md
-rw-rw-r-- 1 1000 1000 91 Jun 7 2017 CREDITS
drwxrwxr-x 75 1000 1000 4096 Jun 7 2017 ext
-rw-rw-r-- 1 1000 1000 20917 Jun 7 2017 EXTENSIONS
-rw-rw-r-- 1 1000 1000 137 Jun 7 2017 footer
-rw-rw-r-- 1 1000 1000 1776 Jun 7 2017 generated_lists
-rwxrwxr-x 1 1000 1000 581 Jun 7 2017 genfiles
-rw-rw-r-- 1 1000 1000 1143 Jun 7 2017 header
-rw-rw-r-- 1 1000 1000 87836 Jun 7 2017 INSTALL
-rw-rw-r-- 1 1000 1000 0 Jun 7 2017 install-sh
-rw-rw-r-- 1 1000 1000 3218 Jun 7 2017 LICENSE
-rw-rw-r-- 1 1000 1000 199728 Jun 7 2017 ltmain.sh
drwxrwxr-x 3 1000 1000 4096 Jun 7 2017 main
-rwxrwxr-x 1 1000 1000 4129 Jun 7 2017 makedist
-rw-rw-r-- 1 1000 1000 1088 Jun 7 2017 Makefile.frag
-rw-rw-r-- 1 1000 1000 2485 Jun 7 2017 Makefile.gcov
-rw-rw-r-- 1 1000 1000 7236 Jun 7 2017 Makefile.global
-rw-rw-r-- 1 1000 1000 5317 Jun 7 2017 makerpm
-rw-rw-r-- 1 1000 1000 0 Jun 7 2017 missing
-rw-rw-r-- 1 1000 1000 0 Jun 7 2017 mkinstalldirs
drwxrwxr-x 2 1000 1000 4096 Jun 7 2017 netware
-rw-rw-r-- 1 1000 1000 135093 Jun 7 2017 NEWS
drwxrwxr-x 2 1000 1000 4096 Jun 7 2017 pear
-rw-rw-r-- 1 1000 1000 1489 Jun 7 2017 php7.spec.in
-rw-rw-r-- 1 1000 1000 2523 Jun 7 2017 php.gif
-rw-rw-r-- 1 1000 1000 71064 Jun 7 2017 php.ini-development
-rw-rw-r-- 1 1000 1000 71096 Jun 7 2017 php.ini-production
-rw-rw-r-- 1 1000 1000 7010 Jun 7 2017 README.EXT_SKEL
-rw-rw-r-- 1 1000 1000 5026 Jun 7 2017 README.GIT-RULES
-rw-rw-r-- 1 1000 1000 5417 Jun 7 2017 README.input_filter
-rw-rw-r-- 1 1000 1000 3426 Jun 7 2017 README.MAILINGLIST_RULES
-rw-rw-r-- 1 1000 1000 1608 Jun 7 2017 README.md
-rw-rw-r-- 1 1000 1000 6040 Jun 7 2017 README.namespaces
-rw-rw-r-- 1 1000 1000 5237 Jun 7 2017 README.NEW-OUTPUT-API
-rw-rw-r-- 1 1000 1000 7528 Jun 7 2017 README.PARAMETER_PARSING_API
-rw-rw-r-- 1 1000 1000 19766 Jun 7 2017 README.REDIST.BINS
-rw-rw-r-- 1 1000 1000 12934 Jun 7 2017 README.RELEASE_PROCESS
-rw-rw-r-- 1 1000 1000 5086 Jun 7 2017 README.SELF-CONTAINED-EXTENSIONS
-rw-rw-r-- 1 1000 1000 15355 Jun 7 2017 README.STREAMS
-rw-rw-r-- 1 1000 1000 8126 Jun 7 2017 README.SUBMITTING_PATCH
-rw-rw-r-- 1 1000 1000 6695 Jun 7 2017 README.TESTING
-rw-rw-r-- 1 1000 1000 4958 Jun 7 2017 README.TESTING2
-rw-rw-r-- 1 1000 1000 4261 Jun 7 2017 README.UNIX-BUILD-SYSTEM
-rw-rw-r-- 1 1000 1000 109 Jun 7 2017 README.WIN32-BUILD-SYSTEM
-rwxrwxr-x 1 1000 1000 82234 Jun 7 2017 run-tests.php
drwxrwxr-x 10 1000 1000 4096 Jun 7 2017 sapi
drwxrwxr-x 4 1000 1000 4096 Jun 7 2017 scripts
-rwxrwxr-x 1 1000 1000 2104 Jun 7 2017 server-tests-config.php
-rwxrwxr-x 1 1000 1000 52726 Jun 7 2017 server-tests.php
-rwxrwxr-x 1 1000 1000 108 Jun 7 2017 snapshot
-rw-rw-r-- 1 1000 1000 10 Jun 7 2017 stamp-h.in
-rw-rw-r-- 1 1000 1000 1 Jun 7 2017 stub.c
drwxrwxr-x 10 1000 1000 4096 Jun 7 2017 tests
drwxrwxr-x 3 1000 1000 4096 Jun 7 2017 travis
drwxrwxr-x 3 1000 1000 4096 Jun 7 2017 TSRM
-rw-rw-r-- 1 1000 1000 23356 Jun 7 2017 UPGRADING
-rw-rw-r-- 1 1000 1000 3418 Jun 7 2017 UPGRADING.INTERNALS
-rwxrwxr-x 1 1000 1000 159 Jun 7 2017 vcsclean
drwxrwxr-x 3 1000 1000 4096 Jun 7 2017 win32
drwxrwxr-x 4 1000 1000 4096 Jun 7 2017 Zend
配置，编译和安装
官网配置：http://php.net/manual/zh/install.unix.nginx.php
./configure --prefix=/usr/local/php
--with-apxs2=/usr/local/httpd/bin/apxs
--with-config-file-path=/usr/local/lib
--with-pdo-mysql=/usr/local/mysql
--with-zlib-dir=/usr/lib
./configure --prefix=/usr/local/php
--with-apxs2=/usr/local/httpd/bin/apxs
--with-config-file-path=/usr/local/lib
--with-pdo-mysql=/usr/local/mysql
--with-zlib-dir=/usr/lib
--with-apxs2=/usr/sbin/apxs
--with-apxs2=/usr/sbin/apxs
--with-mysql=/usr
--with-mysqli=/usr/bin/mysql_config
[root@iZwz9ezkmfgg9sw1ujpt5zZ php-7.1.6]# make install
Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20160303/
Installing PHP CLI binary: /usr/local/php/bin/
。。。
nstalling PEAR environment: /usr/local/php/lib/php/
[PEAR] Archive_Tar - installed: 1.4.2
[PEAR] Console_Getopt - installed: 1.4.1
[PEAR] Structures_Graph- installed: 1.1.1
[PEAR] XML_Util - installed: 1.4.2
[PEAR] PEAR - installed: 1.10.4
Wrote PEAR system config file at: /usr/local/php/etc/pear.conf
You may want to add: /usr/local/php/lib/php to your php.ini include_path
/usr/local/php/php-7.1.6/build/shtool install -c ext/phar/phar.phar /usr/local/php/bin
ln -s -f phar.phar /usr/local/php/bin/phar
Installing PDO headers: /usr/local/php/include/php/ext/pdo/
[root@iZwz9ezkmfgg9sw1ujpt5zZ php-7.1.6]#
创建配置文件
[root@iZwz9ezkmfgg9sw1ujpt5zZ php-7.1.6]# cp php.ini-development /usr/local/php/php.ini
[root@iZwz9ezkmfgg9sw1ujpt5zZ etc]# ll
total 16
-rw-r--r-- 1 root root 1233 Mar 5 11:23 pear.conf
-rw-r--r-- 1 root root 4463 Mar 5 11:22 php-fpm.conf.default
drwxr-xr-x 2 root root 4096 Mar 5 11:22 php-fpm.d
[root@iZwz9ezkmfgg9sw1ujpt5zZ etc]# cp php-fpm.conf.default php-fpm.conf
[root@iZwz9ezkmfgg9sw1ujpt5zZ etc]# cd php-fpm.d
[root@iZwz9ezkmfgg9sw1ujpt5zZ php-fpm.d]# ll
total 20
-rw-r--r-- 1 root root 18517 Mar 5 11:22 www.conf.default
[root@iZwz9ezkmfgg9sw1ujpt5zZ php-fpm.d]# cp www.conf.default www.conf
启动
[root@iZwz9ezkmfgg9sw1ujpt5zZ php]# ps -ef|grep php
root 13603 1 0 14:48 ? 00:00:00 php-fpm: master process (/usr/local/php/etc/php-fpm.conf)
nobody 13604 13603 0 14:48 ? 00:00:00 php-fpm: pool www
nobody 13605 13603 0 14:48 ? 00:00:00 php-fpm: pool www
root 13608 10402 0 14:49 pts/0 00:00:00 grep --color=auto php
git安装
[root@iZwz9938t1plpkhn7ajjkrZ local]# yum install git
Loaded plugins: fastestmirror
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/7): base/7/x86_64/group_gz | 166 kB 00:00:00
...
Installed:
git.x86_64 0:1.8.3.1-20.el7
Dependency Installed:
perl-Error.noarch 1:0.17020-2.el7 perl-Git.noarch 0:1.8.3.1-20.el7 perl-TermReadKey.x86_64 0:2.30-20.el7
rsync.x86_64 0:3.1.2-4.el7
Complete!
[root@iZwz9938t1plpkhn7ajjkrZ local]# git --version
git version 1.8.3.1
位置
[root@iZwz9938t1plpkhn7ajjkrZ git-core]# pwd
/usr/libexec/git-core
[root@iZwz9938t1plpkhn7ajjkrZ git-core]# ll
total 176032
-rwxr-xr-x 113 root root 1523792 Nov 20 00:06 git
-rwxr-xr-x 113 root root 1523792 Nov 20 00:06 git-add
-rwxr-xr-x 1 root root 36655 Nov 20 00:06 git-add--interactive
-rwxr-xr-x 1 root root 22361 Nov 20 00:05 git-am
...
-rwxr-xr-x 113 root root 1523792 Nov 20 00:06 git-verify-tag
-rwxr-xr-x 1 root root 4215 Nov 20 00:05 git-web--browse
-rwxr-xr-x 113 root root 1523792 Nov 20 00:06 git-whatchanged
-rwxr-xr-x 113 root root 1523792 Nov 20 00:06 git-write-tree
drwxr-xr-x 2 root root 4096 Mar 6 09:49 mergetools
[root@iZwz9938t1plpkhn7ajjkrZ git-core]#
配置
配置用户名与邮箱，仅仅作为提交用户身份证（待测试）
[root@izwz91rl2qyews1sgkymi9z ~]# git config --global user.name "设置一个用户名，字符串A"
[root@izwz91rl2qyews1sgkymi9z ~]# git config --global user.email "你的邮箱，字符串B"
查看
进入$HOME(/root,可用echo输出验证)，会有一个.gitconfig文件。
[root@izwz91rl2qyews1sgkymi9z ~]# cat .gitconfig
[user]
name = 前面的字符串A
email = 前面的字符串B
[root@izwz91rl2qyews1sgkymi9z ~]# pwd
/root
[root@izwz91rl2qyews1sgkymi9z ~]#
生成SSH公钥
将生成的公钥放在GitHub上面
[root@iZwz9938t1plpkhn7ajjkrZ ~]# cat .gitconfig
[user]
name = gczx
email = [email protected]
[root@iZwz9938t1plpkhn7ajjkrZ ~]# ssh-keygen -t rsa -C "[email protected]"
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:PL0vkEq+FSC0yMsGvUUT0LO8yfiN2p5JHkUSoN0/e04 [email protected]
The key's randomart image is:
+---[RSA 2048]----+
| o+*. |
| = =o+ |
|o =.*oo |
| o +o= o . |
| =o o+ S.. |
| .. +..ooo . |
| .o=..E.. |
| +o++= .. |
| .o* ... .. |
+----[SHA256]-----+
[root@iZwz9938t1plpkhn7ajjkrZ ~]#
这个是已经生成ssh的，重新生成的过程。
[root@izwz91rl2qyews1sgkymi9z ~]# ssh-keygen -t rsa -C "[email protected]"
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
/root/.ssh/id_rsa already exists.
Overwrite (y/n)?
[root@izwz91rl2qyews1sgkymi9z ~]#