手机qq网页版网站,东莞大岭山建网站公司,成都 直播 网站建设,html教程入门目录
一、Linux
1、Linux异常解决
1、JDK安装
1、Linux卸载JDK
2、Linux安装JDK
2、Redis安装 一、Linux
1、Linux异常解决
1、Another app is currently holding the yum lock; waiting for it to exit...
解决办法:
rm -f /var/run/yum.pid1、杀死这个应用程序
ps a…目录
一、Linux
1、Linux异常解决
1、JDK安装
1、Linux卸载JDK
2、Linux安装JDK
2、Redis安装 一、Linux
1、Linux异常解决
1、Another app is currently holding the yum lock; waiting for it to exit...
解决办法:
rm -f /var/run/yum.pid1、杀死这个应用程序
ps aux | grep yum(查询有关yum的进程找到那个更新进程)
命令kill -s 9 2833 pid
kill 的用法 kill [信号代码] 进程ID
注信号代码可以省略我们常用的信号代码是 -s 9 表示强制终止
2833是这个进程的ID
2、强制关掉yum进程并重新运行yum
#rm -f /var/run/yum.pid
注强制删除#rm -f
解释强制删除文件 /var/run/yum.pid
如果上面方法不行的话尝试使用下面的方法。
1、JDK安装
1、Linux卸载JDK
1、查看java -version查看linux系统是否已经安装jdk
[rootlocalhost java]# java -version
java version 1.8.0_202
Java(TM) SE Runtime Environment (build 1.8.0_202-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode)2、查看jdk安装的路径which java
[rootlocalhost java]# which java
/usr/java/jdk1.8.0_202/bin/java3、卸载jdk
rm -rf /usr/java/jdk1.8.0_202/bin/java4、删除环境变量export开头的三行 [rootlocalhost java]# vi /etc/profile
export JAVA_HOME/usr/java/jdk1.8.0_202
export PATH$JAVA_HOME/bin:$PATH
export CLASSPATH.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar5、检查下系统自带的jdk并删除它
rpm -qa |grep java
rpm -qa |grep jdk
rpm -qa |grep gcj
2、Linux安装JDK
JDK官方下载地址
1、将文件jdk-21.0.1_linux-x64_bin.tar.gz移动到/usr/java下usr下没有java文件夹可以先创建java文件夹mkdir java
[rootlocalhost java]# ls
jdk-21.0.1_linux-x64_bin.tar.gz
2、解压
[rootlocalhost java]# tar -zxvf jdk-21.0.1_linux-x64_bin.tar.gz
3、在/etc/profile文件中配置环境变量使JDK在所有用户中生效
编辑文件在最后添加如下三行
export JAVA_HOME/usr/java/jdk-21.0.1
export PATH$JAVA_HOME/bin:$PATH
export CLASSPATH.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
4、保存退出后执行source /etc/profile使修改的环境变量生效
[rootlocalhost java]# source /etc/profile
5、使用java -version命令测试是否成功
[rootlocalhost etc]# java -version
java version 21.0.1 2023-10-17 LTS
Java(TM) SE Runtime Environment (build 21.0.112-LTS-29)
Java HotSpot(TM) 64-Bit Server VM (build 21.0.112-LTS-29, mixed mode, sharing)
2、Redis安装
Redis是基于c语言编写的需要安装依赖需要安装gcc
yum install gcc-c
查看gcc版本 gcc -v
下载Redis
wget http://download.redis.io/releases/redis-7.2.3.tar.gz[rootlocalhost redis]# wget http://download.redis.io/releases/redis-7.2.3.tar.gz --2023-11-24 00:18:22-- http://download.redis.io/releases/redis-7.2.3.tar.gz
Resolving download.redis.io (download.redis.io)... 45.60.125.1
Connecting to download.redis.io (download.redis.io)|45.60.125.1|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3384816 (3.2M) [application/octet-stream]
Saving to: ‘redis-7.2.3.tar.gz’100%[] 3,384,816 200KB/s in 23s2023-11-24 00:18:56 (146 KB/s) - ‘redis-7.2.3.tar.gz’ saved [3384816/3384816]
解压并安装Redis
tar -zvxf redis-7.2.3.tar.gz
cd redis-7.2.3/
make[rootlocalhost redis-7.2.3]# make install
cd src make install
which: no python3 in (/usr/java/jdk-21.0.1/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
make[1]: Entering directory /usr/lwz_tools/redis/redis-7.2.3/srcCC Makefile.dep
make[1]: Leaving directory /usr/lwz_tools/redis/redis-7.2.3/src
which: no python3 in (/usr/java/jdk-21.0.1/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
make[1]: Entering directory /usr/lwz_tools/redis/redis-7.2.3/srcHint: Its a good idea to run make test ;)INSTALL redis-serverINSTALL redis-benchmarkINSTALL redis-cli
make[1]: Leaving directory /usr/lwz_tools/redis/redis-7.2.3/src
[rootlocalhost redis-7.2.3]#
redis默认安装路径/usr/local/bin
[rootlocalhost redis-7.2.3]# cd /usr/local/bin
[rootlocalhost bin]# ls
redis-benchmark redis-check-aof redis-check-rdb redis-cli redis-sentinel redis-serverredis默认不是后台启动更改启动方式
有关redis配置文件的一些说明
然后修改redis.conf文件中的一些配置
# 允许访问的地址默认是127.0.0.1会导致只能在本地访问。修改为0.0.0.0则可以在任意IP访问生产环境不要设置为0.0.0.0
bind 0.0.0.0
# 守护进程修改为yes后即可后台运行
daemonize yes
# 密码设置后访问Redis必须输入密码
requirepass 123456# 监听的端口
port 6379
# 工作目录默认是当前目录也就是运行redis-server时的命令日志、持久化等文件会保存在这个目录
dir .
# 数据库数量设置为1代表只使用1个库默认有16个库编号0~15
databases 1
# 设置redis能够使用的最大内存
maxmemory 512mb
# 日志文件默认为空不记录日志可以指定日志文件名
logfile redis.log
启动redis-server服务
通过指定配置文件启动服务
redis-server redisconfig/redis.conf
使用redis-cli连接测试
redis-cli -p 6379[rootlocalhost bin]# redis-cli -p 6379
127.0.0.1:6379 ping
PONG
127.0.0.1:6379#有密码需要 auth 你的密码
查看redis的进程是否开启新开一个会话
[rootlocalhost ~]# ps -ef|grep redis
root 7328 1 0 02:06 ? 00:00:00 redis-server 0.0.0.0:6379
root 7333 1565 0 02:06 pts/0 00:00:00 redis-cli -p 6379
root 7384 7345 0 02:12 pts/1 00:00:00 grep --colorauto redis
[rootlocalhost ~]#如何关闭redis服务
127.0.0.1:6379 shutdown
not connected exit
[rootlocalhost bin]#再次查看服务
[rootlocalhost ~]# ps -ef|grep redis
root 7386 7345 0 02:14 pts/1 00:00:00 grep --colorauto redis设置Redis开机自启动
首先新建一个系统服务文件
vi /etc/systemd/system/redis.service
内容 /usr/local/bin/redis.conf指定配置文件路径可修改
[Unit]
Descriptionredis-server
Afternetwork.target[Service]
Typeforking
ExecStart/usr/local/bin/redis-server /usr/local/bin/redis.conf
PrivateTmptrue[Install]
WantedBymulti-user.target
然后重载系统服务
systemctl daemon-reload
现在我们可以用下面这组命令来操作redis了
# 启动
systemctl start redis
# 停止
systemctl stop redis
# 重启
systemctl restart redis
# 查看状态
systemctl status redis
执行下面的命令可以让redis开机自启
systemctl enable redis
性能测试
redis 性能测试的基本命令如下
redis-benchmark [option] [option value]
测试100个并发链接每个并发100000请求
redis-benchmark -h localhost -p 6379 -c 100 -n 100000
Summary:throughput summary: 10989.01 requests per secondlatency summary (msec):avg min p50 p95 p99 max5.135 1.600 4.479 9.823 13.223 25.231LRANGE_600 (first 600 elements) 100000 requests completed in 10.48 seconds #100000个请求 所有请求在10.48秒完成100 parallel clients #100个客户端3 bytes payload #每次3个字节keep alive: 1 #活跃1个host configuration save: 3600 1 300 100 60 10000host configuration appendonly: nomulti-thread: noLatency by percentile distribution:
0.000% 1.463 milliseconds (cumulative count 1)
50.000% 5.175 milliseconds (cumulative count 50271)
75.000% 5.999 milliseconds (cumulative count 75004)
87.500% 8.087 milliseconds (cumulative count 87514)
93.750% 10.631 milliseconds (cumulative count 93761)
96.875% 13.255 milliseconds (cumulative count 96875)
98.438% 15.199 milliseconds (cumulative count 98438)
99.219% 17.823 milliseconds (cumulative count 99221)
99.609% 20.319 milliseconds (cumulative count 99611)
99.805% 23.279 milliseconds (cumulative count 99807)
99.902% 25.503 milliseconds (cumulative count 99903)
99.951% 26.863 milliseconds (cumulative count 99952)
99.976% 27.727 milliseconds (cumulative count 99976)
99.988% 28.351 milliseconds (cumulative count 99988)
99.994% 28.847 milliseconds (cumulative count 99994)
99.997% 29.087 milliseconds (cumulative count 99997)
99.998% 29.279 milliseconds (cumulative count 99999)
99.999% 29.391 milliseconds (cumulative count 100000)
100.000% 29.391 milliseconds (cumulative count 100000) Linux常用命令
干我们这行啥时候懈怠就意味着长进的停止长进的停止就意味着被淘汰只能往前冲直到凤凰涅槃的一天
