JoyLau's Blog

JoyLau 的技术学习与思考

发表于 更新于 分类于
物理机安装 node_exporter

步骤

https://copr.fedorainfracloud.org/coprs/ibotty/prometheus-exporters/

curl -Lo /etc/yum.repos.d/_copr_ibotty-prometheus-exporters.repo https://copr.fedorainfracloud.org/coprs/ibotty/prometheus-exporters/repo/epel-7/ibotty-prometheus-exporters-epel-7.repo

yum -y install node_exporter

systemctl enable node_exporter

systemctl start node_exporter

echo “success”

关闭机器防火墙：

systemctl stop firewalld.service

systemctl disable firewalld.service

发表于 更新于 分类于
替换 jar 包中的 class 文件

在test.jar 的同目录下新建一个与 NeedReplace 类的全路径相同的目录，执行以下命令
md com\lovedata\bigdata\jar
执行 java -jar 来进行替换
jar uvf test.jar com\lovedata\bigdata\jar\NeedReplace.class

发表于 更新于 分类于
Docker MySQL 最简单的主从搭建

主：

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version: "3"
services:
  mysql:
    image: mysql:8.0.22
    container_name: mysql
    restart: always
    security_opt:
      - seccomp:unconfined
    ports:
      - 3306:3306
    volumes:
      - ./mysql-data:/var/lib/mysql
      - ./my.cnf:/etc/mysql/my.cnf
    environment:
      - MYSQL_ROOT_PASSWORD=Kaiyuan@2020
      - TZ=Asia/Shanghai

my.cnf:

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[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL

# Custom config should go here
!includedir /etc/mysql/conf.d/

max_connections=1024

sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'

server-id=1

最主要的配置： server-id=1

从：

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version: "3"
services:
  mysql:
    image: mysql:8.0.22
    container_name: mysql-slave-1
    restart: always
    security_opt:
      - seccomp:unconfined
    ports:
      - 3306:3306
    volumes:
      - ./mysql-data:/var/lib/mysql
      - ./my.cnf:/etc/mysql/my.cnf
      - ./init.sql:/docker-entrypoint-initdb.d/init.sql
    environment:
      - MYSQL_ROOT_PASSWORD=Kaiyuan@2020
      - TZ=Asia/Shanghai

my.cnf:

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[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL

# Custom config should go here
!includedir /etc/mysql/conf.d/

max_connections=1024

sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'

server-id=2
super-read-only

和主不同的是， server-id=2, super-read-only 开启只读模式

init.sql:

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change master to master_host='10.55.3.122',master_port=3306,master_user='root',master_password='Kaiyuan@2020';
reset slave;
start slave;

发表于 更新于 分类于
Feign 单独为某个接口提供超时配置

配置

  1. 将原先的接口提取出来，单独写一份
    @FeignClient(value = “etc-exchange”, contextId = “etc-exchange-2”, fallback = PsamRemoteServiceFallback2.class)
    重新声明一个 contextId

  2. 添加配置项

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feign:
  client:
    config:
      etc-exchange-2:
        connect-timeout: 3000
        read-timeout: 3000

发表于 更新于 分类于
Jackson 关于日期时间的注解

说明

@JsonFormat(pattern = “yyyy-MM-dd HH:mm:ss”) : 后端 =>前端的转换
@DateTimeFormat(pattern = “yyyy-MM-dd’T’HH:mm:ss”) ： 前端 => 后端的转换
@JsonDeserialize(using = LocalDateTimeDeserializer.class) ： jackson 反序列化
@JsonSerialize(using = LocalDateTimeSerializer.class)： jackson 序列化

注意：

  1. 当 @JsonFormat 和 @JsonDeserialize 或者 @JsonSerialize 同时存在时， @JsonFormat 优先级更高

  2. @JsonFormat不仅可以完成后台到前台参数传递的类型转换，还可以实现前台到后台类型转换。

当content-type为application/json时，优先使用@JsonFormat的pattern进行类型转换。而不会使用@DateTimeFormat进行类型转换。

SpringBoot4 Jackson 配置记录

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@Bean
public JsonMapperBuilderCustomizer customizer() {
    return builder -> {
        builder.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        builder.changeDefaultPropertyInclusion(incl ->
                incl.withValueInclusion(JsonInclude.Include.ALWAYS));

        builder.addModule(
                new SimpleModule()
                        // Long 的序列化
                        .addSerializer(Long.class, StringSerializer.instance)
                        // LocalDateTime 的序列化
                        .addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")))
                        // LocalDateTime 的反序列化
                        .addDeserializer(LocalDateTime.class,
                                new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))));
    };
}

发表于 更新于 分类于
Grafana 设置二级目录及配置 Nginx 代理

步骤

设置环境变量：

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  env:
  - name: GF_SERVER_ROOT_URL
    value: "%(protocol)s://%(domain)s:%(http_port)s/grafana"
  - name: GF_SERVER_SERVE_FROM_SUB_PATH
value: "true"

此时 NGINX 进行反向代理的配置：

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location /grafana/ {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://10.55.3.160:31120/;
}
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