23 | March | 2019 | LongSheng

Install .NET Core Runtime on Linux CentOS / Oracle x64

Add the dotnet product feed Before installing .NET, you’ll need to register the Microsoft key, register the product repository, and install required dependencies. This only needs to be done once per machine. Open a terminal and run the following commands:

1	sudo rpm -Uvh https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm

Install the .NET Runtime Update the products available for installation, then install the .NET Runtime. In your terminal, run the following commands:

sudo yum update

sudo yum install aspnetcore-runtime-2.2

也可以安装SDK

yum install dotnet-sdk-2.2

The previous command will install the .NET Core Runtime Bundle, which includes the .NET Core runtime and the ASP.NET Core runtime. To […]

龙生 23 Mar 2019

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在CentOS7上安装RabbitMQ

安装过程参考官网： Installing on RPM-based Linux (RHEL, CentOS, Fedora, openSUSE) 首先需要安装erlang，参考：http://fedoraproject.org/wiki/EPEL/FAQ#howtouse

1 2	rpm -Uvh https://mirrors.tuna.tsinghua.edu.cn/epel/epel-release-latest-7.noarch.rpm yum install erlang

安装过程中会有提示，一路输入“y”即可。完成后安装RabbitMQ：先下载rpm：

1	wget http://www.rabbitmq.com/releases/rabbitmq-server/v3.6.6/rabbitmq-server-3.6.6-1.el7.noarch.rpm

下载完成后安装：

1	yum install rabbitmq-server-3.6.6-1.el7.noarch.rpm

完成后启动服务：

1	service rabbitmq-server start

可以查看服务状态：

1	service rabbitmq-server status

这里可以看到log文件的位置，转到文件位置，打开文件：这里显示的是没有找到配置文件，我们可以自己创建这个文件

1 2	cd /etc/rabbitmq/ vi rabbitmq.config

编辑内容如下：

1	[{rabbit, [{loopback_users, []}]}].

这里的意思是开放使用，rabbitmq默认创建的用户guest，密码也是guest，这个用户默认只能是本机访问，localhost或者127.0.0.1，从外部访问需要添加上面的配置。保存配置后重启服务：

1 2	service rabbitmq-server stop service rabbitmq-server start

此时就可以从外部访问了，但此时再看log文件，发现内容还是原来的，还是显示没有找到配置文件，可以手动删除这个文件再重启服务，不过这不影响使用

rm rabbit\@mythsky.log

service rabbitmq-server stop

service rabbitmq-server start

开放5672端口：

1 2	firewall-cmd --zone=public --add-port=5672/tcp --permanent firewall-cmd --reload

在Windows上进行测试：新建.net core控制台项目，引用RabbitMQ.Client包：

1	Install-Package RabbitMQ.Client

测试代码：

public static void Main(string[] args)

{

ConnectionFactory factory = new ConnectionFactory();

factory.UserName = "guest";

factory.Password = "guest";

factory.VirtualHost = "/";

factory.HostName = "localhost";

//factory.HostName = "10.255.19.111";

try

{

IConnection conn = factory.CreateConnection();

IModel model = conn.CreateModel();

string exchangeName = "test";

string queueName = "testq";

string routingKey = "first";

model.ExchangeDeclare(exchangeName, ExchangeType.Direct);

model.QueueDeclare(queueName, false, false, false, null);

model.QueueBind(queueName, exchangeName, routingKey, null);

byte[] messageBodyBytes = System.Text.Encoding.UTF8.GetBytes("Hello, world!");

model.BasicPublish(exchangeName, routingKey, null, messageBodyBytes);

Console.WriteLine("message sended.");

bool noAck = false;

BasicGetResult result = model.BasicGet(queueName, noAck);

if (result == null)

{

Console.Write("no message.");

}

else

{

IBasicProperties props = result.BasicProperties;

byte[] body = result.Body;

model.BasicAck(result.DeliveryTag, false);

string message = System.Text.Encoding.UTF8.GetString(body);

Console.Write(message);

}

catch (Exception ex)

{

Console.Write(ex.Message);

}

也可以使用官网的例子（这里更清晰）： http://www.rabbitmq.com/tutorials/tutorial-one-dotnet.html 发送端：

using System;

using System.Text;

using RabbitMQ.Client;

namespace rabbitMQ

{

public class Send

{

public static void Main()

{

var factory = new ConnectionFactory() { HostName = "192.168.0.169", UserName = "user", Password = "pass" };

using (var connection = factory.CreateConnection())

using (var channel = connection.CreateModel())

{

channel.QueueDeclare(

queue: "hello",

durable: false,

exclusive: false,

autoDelete: false,

arguments: null);

string message = "Hello World!" + DateTime.Now;

var body = Encoding.UTF8.GetBytes(message);

channel.BasicPublish(exchange: "",

routingKey: "hello",

basicProperties: null,

body: body);

Console.WriteLine(" [x] Sent {0}", message);

}

Console.WriteLine(" Press [enter] to exit.");

Console.ReadLine();

}

接收端：

using System;

using System.Collections.Generic;

using System.Text;

using System.Threading;

using RabbitMQ.Client;

using RabbitMQ.Client.Events;

namespace rabbitMQ

{

class Receive

{

public static void Main()

{

var factory = new ConnectionFactory() { HostName = "192.168.0.169", UserName = "user", Password = "pass" };

using (var connection = factory.CreateConnection())

using (var channel = connection.CreateModel())

{

channel.QueueDeclare(

queue: "hello",

durable: false,

exclusive: false,

autoDelete: false,

arguments: null);

var consumer = new EventingBasicConsumer(channel);

consumer.Received += (model, ea) =>

{

var body = ea.Body;

var message = Encoding.UTF8.GetString(body);

Console.WriteLine(" [x] Received {0}", message);

};

channel.BasicConsume(queue: "hello",

autoAck: true,

consumer: consumer);

Console.WriteLine(" Press [enter] to exit.");

Console.ReadLine();

}

在Windows上发送，在CentOS上接收，效果如图：开启管理UI：

rabbitmq-plugins enable rabbitmq_management

firewall-cmd --zone=public --add-port=15672/tcp --permanent

firewall-cmd --reload

在Windows下打开地址：

1	http://10.255.19.111:15672

用户名和密码都是 guest 这样就可以方便管理RabbitMQ了。 from:https://www.cnblogs.com/uptothesky/p/6094357.html

龙生 23 Mar 2019

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RabbitMQ用户增删及权限控制

用户角色分类 none：无法登录控制台不能访问 management plugin，通常就是普通的生产者和消费者。 management：普通管理者。仅可登陆管理控制台(启用management plugin的情况下)，无法看到节点信息，也无法对policies进行管理。用户可以通过AMQP做的任何事外加：列出自己可以通过AMQP登入的virtual hosts 查看自己的virtual hosts中的queues, exchanges 和 bindings 查看和关闭自己的channels 和 connections 查看有关自己的virtual hosts的“全局”的统计信息，包含其他用户在这些virtual hosts中的活动。 policymaker：策略制定者。 management可以做的任何事外加：查看、创建和删除自己的virtual hosts所属的policies和parameters monitoring：监控者。 management可以做的任何事外加：列出所有virtual hosts，包括他们不能登录的virtual hosts 查看其他用户的connections和channels 查看节点级别的数据如clustering和memory使用情况查看真正的关于所有virtual hosts的全局的统计信息同时可以查看rabbitmq节点的相关信息(进程数，内存使用情况，磁盘使用情况等) administrator：超级管理员。 policymaker和monitoring可以做的任何事外加: 创建和删除virtual hosts 查看、创建和删除users 查看创建和删除permissions 关闭其他用户的connections 创建用户

rabbitmqctl add_user {用户名} {密码}

// 设置权限

rabbitmqctl set_user_tags {用户名} {权限}

例：创建一个超级用户

1 2	rabbitmqctl add_user admin1 admin1 rabbitmqctl set_user_tags admin1 administrator

查看用户列表

1	rabbitmqctl list_users

为用户赋权

// 使用户user1具有vhost1这个virtual host中所有资源的配置、写、读权限以便管理其中的资源

rabbitmqctl set_permissions -p vhost1 user1 '.*' '.*' '.*'

// 查看权限

rabbitmqctl list_user_permissions user1

rabbitmqctl list_permissions -p vhost1

// 清除权限

rabbitmqctl clear_permissions [-p VHostPath] User

删除用户

1	rabbitmqctl delete_user Username

修改用户的密码

1	rabbitmqctl change_password Username Newpassword

from: https://www.cnblogs.com/xinxiucan/p/7940953.html

龙生 23 Mar 2019

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RabbitMQ从入门到精通—安装

安装脚本

yum install wget -y

#Download RabbitMQ and Erlang

wget https://www.rabbitmq.com/releases/rabbitmq-server/v3.6.9/rabbitmq-server-3.6.9-1.el6.noarch.rpm

wget https://www.rabbitmq.com/releases/erlang/erlang-19.0.4-1.el6.x86_64.rpm

#Install Erlang and RabbitMQ

rpm -ivh erlang-19.0.4-1.el6.x86_64.rpm

rpm --import http://www.rabbitmq.com/rabbitmq-signing-key-public.asc

yum install rabbitmq-server-3.6.9-1.el6.noarch.rpm -y

发现错误

1 2	1. 安装依赖Requires: socat 2. 安装socat的时候提示需要tcp_wrappers

解决方案

wget –no-cache http://www.convirture.com/repos/definitions/rhel/6.x/convirt.repo -O /etc/yum.repos.d/convirt.repo

yum install socat -y

使用https://rpmfind.net/linux/rpm2html/search.php搜索tcp_wrappers，下载，rpm -ivh tcp_wrappers.version

启动RabbitMQ

chkconfig rabbitmq-server on

/sbin/service rabbitmq-server start

# 修改密码

rabbitmqctl change_password guest welcome123

# 启动管理界面

rabbitmq-plugins enable rabbitmq_management

使用过程错误小记 user ‘guest’ – User can only log in via localhost 登录响应如下：

1	{"error":"not_authorised","reason":"User can only log in via localhost"}

我实在docker中创建rabbitmq的，然后将端口15672映射到宿主机器上的15672，所以也算是远程登录，而guest用户要求只能使用localhost登录，所以要想远程登录必须新建用户。

rabbitmqctl add_user {username} {password}

# 例：创建admin用户

rabbitmqctl add_user admin 123456

新建用户无法登录

1	{"error":"not_authorised","reason":"Not management user"}

需要授予用户角色

rabbitmqctl set_user_tags {username} {role}

# 例

rabbitmqctl set_user_tags admin administrator

用户授权

1 2	rabbitmqctl set_permissions [-p vhostpath] {user} {conf} {write} {read} rabbitmqctl set_permissions -p / admin "." "." ".*"

关于RabbitMQ权限和角色管理参考：http://blog.csdn.net/zyz511919766/article/details/42292655 from:https://www.dev-heaven.com/posts/1914.html

龙生 23 Mar 2019

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Redis服务停止报错解决方案[NOAUTH Authentication required]

Redis服务器设置密码后，使用service redis stop 会出现以下信息： service redis stop Stopping … OK (error) NOAUTH Authentication required. Waiting for Redis to shutdown … Waiting for Redis to shutdown … Waiting for Redis to shutdown … Waiting for Redis to shutdown … Waiting for Redis to shutdown … Waiting for Redis to shutdown … Waiting for Redis to shutdown … Waiting for Redis to shutdown … 出现这样的错误信息，redis 这时是没有停止服务的。可以使用ps -ef | grep redis 查进程号然后kill 掉，如果在deamon下还需要去删除pid文件，有点繁琐。解决办法：用redis-cli 密码登陆（redis-cli -a password）就OK了。再用ps -ef | grep redis 可以看到redis进程已经正常退出。修改redis服务脚本，加入如下所示的红色授权信息即可： vi /etc/init.d/redis $CLIEXEC -a "password" -p $REDISPORT shutdown from:https://www.cnblogs.com/jeffen/p/6068745.html

龙生 23 Mar 2019

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CENTOS7下安装REDIS

一、安装redis 第一步：下载redis安装包 wget http://download.redis.io/releases/redis-4.0.6.tar.gz

[root@iZwz991stxdwj560bfmadtZ local]# wget http://download.redis.io/releases/redis-4.0.6.tar.gz

--2017-12-13 12:35:12-- http://download.redis.io/releases/redis-4.0.6.tar.gz

Resolving download.redis.io (download.redis.io)... 109.74.203.151

Connecting to download.redis.io (download.redis.io)|109.74.203.151|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 1723533 (1.6M) [application/x-gzip]

Saving to: ‘redis-4.0.6.tar.gz’

100%[==========================================================================================================>] 1,723,533 608KB/s in 2.8s

2017-12-13 12:35:15 (608 KB/s) - ‘redis-4.0.6.tar.gz’ saved [1723533/1723533]

第二步：解压压缩包 tar -zxvf redis-4.0.6.tar.gz

1	[root@iZwz991stxdwj560bfmadtZ local]# tar -zxvf redis-4.0.6.tar.gz

第三步：yum安装gcc依赖 yum install gcc

1	[root@iZwz991stxdwj560bfmadtZ local]# yum install gcc

遇到选择,输入y即可第四步：跳转到redis解压目录下 cd redis-4.0.6

1	[root@iZwz991stxdwj560bfmadtZ local]# cd redis-4.0.6

第五步：编译安装 make MALLOC=libc

1	[root@iZwz991stxdwj560bfmadtZ redis-4.0.6]# make MALLOC=libc

将/usr/local/redis-4.0.6/src目录下的文件加到/usr/local/bin目录 cd src && make install

[root@iZwz991stxdwj560bfmadtZ redis-4.0.6]# cd src && make install

CC Makefile.dep

Hint: It's a good idea to run 'make test' ;)

INSTALL install

二、启动redis的三种方式先切换到redis src目录下

1	[root@iZwz991stxdwj560bfmadtZ redis-4.0.6]# cd src

1、直接启动redis ./redis-server

[root@iZwz991stxdwj560bfmadtZ src]# ./redis-server

18685:C 13 Dec 12:56:12.507 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo

18685:C 13 Dec 12:56:12.507 # Redis version=4.0.6, bits=64, commit=00000000, modified=0, pid=18685, just started

18685:C 13 Dec 12:56:12.507 # Warning: no config file specified, using the default config. In order to specify a config file use ./redis-server /path/to/redis.conf

_._

_.-``__ ''-._

_.-`` `. `_. ''-._ Redis 4.0.6 (00000000/0) 64 bit

.-`` .-```. ```\/ _.,_ ''-._

( ' , .-` | `, ) Running in standalone mode

|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379

| `-._ `._ / _.-' | PID: 18685

`-._ `-._ `-./ _.-' _.-'

|`-._`-._ `-.__.-' _.-'_.-'|

| `-._`-._ _.-'_.-' | http://redis.io

`-._ `-._`-.__.-'_.-' _.-'

|`-._`-._ `-.__.-' _.-'_.-'|

| `-._`-._ _.-'_.-' |

`-._ `-._`-.__.-'_.-' _.-'

`-._ `-.__.-' _.-'

`-._ _.-'

`-.__.-'

18685:M 13 Dec 12:56:12.508 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

18685:M 13 Dec 12:56:12.508 # Server initialized

18685:M 13 Dec 12:56:12.508 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.

18685:M 13 Dec 12:56:12.508 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

18685:M 13 Dec 12:56:12.508 * Ready to accept connections

如上图：redis启动成功，但是这种启动方式需要一直打开窗口，不能进行其他操作，不太方便。按 ctrl + c可以关闭窗口。 2、以后台进程方式启动redis 第一步：修改redis.conf文件将

1	daemonize no

修改为

1	daemonize yes

第二步：指定redis.conf文件启动 1 ./redis-server /usr/local/redis-4.0.6/redis.conf

[root@iZwz991stxdwj560bfmadtZ src]# ./redis-server /usr/local/redis-4.0.6/redis.conf

18713:C 13 Dec 13:07:41.109 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo

18713:C 13 Dec 13:07:41.109 # Redis version=4.0.6, bits=64, commit=00000000, modified=0, pid=18713, just started

18713:C 13 Dec 13:07:41.109 # Configuration loaded

第三步：关闭redis进程首先使用ps -aux | grep redis查看redis进程

[root@iZwz991stxdwj560bfmadtZ src]# ps -aux | grep redis

root 18714 0.0 0.1 141752 2008 ? Ssl 13:07 0:00 ./redis-server 127.0.0.1:6379

root 18719 0.0 0.0 112644 968 pts/0 R+ 13:09 0:00 grep --color=auto redis

使用kill命令杀死进程

1	[root@iZwz991stxdwj560bfmadtZ src]# kill -9 18714

3、设置redis开机自启动 1、在/etc目录下新建redis目录 mkdir redis

1	[root@iZwz991stxdwj560bfmadtZ etc]# mkdir redis

2、将/usr/local/redis-4.0.6/redis.conf 文件复制一份到/etc/redis目录下，并命名为6379.conf

1	[root@iZwz991stxdwj560bfmadtZ redis]# cp /usr/local/redis-4.0.6/redis.conf /etc/redis/6379.conf

[…]

龙生 23 Mar 2019

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Linux 软件安装到哪里合适，目录详解

Linux 的软件安装目录是也是有讲究的，理解这一点，在对系统管理是有益的 /usr：系统级的目录，可以理解为C:/Windows/，/usr/lib理解为C:/Windows/System32。 /usr/local：用户级的程序目录，可以理解为C:/Progrem Files/。用户自己编译的软件默认会安装到这个目录下。 /opt：用户级的程序目录，可以理解为D:/Software，opt有可选的意思，这里可以用于放置第三方大型软件（或游戏），当你不需要时，直接rm -rf掉即可。在硬盘容量不够时，也可将/opt单独挂载到其他磁盘上使用。源码放哪里？ /usr/src：系统级的源码目录。 /usr/local/src：用户级的源码目录。 —————--翻译——————- /opt Here’s where optional stuff is put. Trying out the latest Firefox beta? Install it to /opt where you can delete it without affecting other settings. Programs in here usually live inside a single folder whick contains all of their data, libraries, etc. 这里主要存放那些可选的程序。你想尝试最新的firefox测试版吗?那就装到/opt目录下吧，这样，当你尝试完，想删掉firefox的时候，你就可以直接删除它，而不影响系统其他任何设置。安装到/opt目录下的程序，它所有的数据、库文件等等都是放在同个目录下面。举个例子：刚才装的测试版firefox，就可以装到/opt/firefox_beta目录下，/opt/firefox_beta目录下面就包含了运行firefox所需要的所有文件、库、数据等等。要删除firefox的时候，你只需删除/opt/firefox_beta目录即可，非常简单。 /usr/local This is where most manually installed(ie. outside of your package manager) software goes. It has the same structure as /usr. It is a good idea to leave /usr to your package manager […]

龙生 23 Mar 2019

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解决Centos6.5中ssh登录时Warning:Permanently added (RSA) to the list of known hosts的警告

当主机使用ssh免密码登录时，弹出Warning:Permanently added (RSA) to the list of known hosts的警告，看着很碍眼。通过以下方法进行解决： 1：vim /etc/ssh/ssh_config（master和slave1都需要设置）找到#StrictHostKeyChecking ask去掉注释，并把ask改为no即可

龙生 23 Mar 2019

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