Java相关技术记录

相关技术记录

目录

查询大于多少文件日志命令

find / -type f -size +500M -print0 | xargs -0 du -h

然后执行 echo "" > xxx.log 将空串写入文件

Arthas(阿尔萨斯)docker版本

docker exec -it  ${containerId} /bin/bash -c "wget https://arthas.aliyun.com/arthas-boot.jar && java -jar arthas-boot.jar"

Maven多模块工程打包指定模块工程方法

Maven多模块工程打包指定模块工程执行如下命令:

mvn clean package -pl 指定模块工程名 -am

参数说明:

-am --also-make 同时构建所列模块的依赖模块;
-amd -also-make-dependents 同时构建依赖于所列模块的模块;
-pl --projects 构建制定的模块,模块间用逗号分隔;
-rf -resume-from 从指定的模块恢复反应堆。

git stash 使用说明

// 暂存本地数据
git stash save -u "备注信息"
// 查看暂存列表
git stash list
// 恢复
git stash apply stash@{id}
// 删除stash
git stash drop stash@{id}
// 查看 stash 的内容
git stash show 
git stash show stash@{id}
git stash show -p

在request中获取body参数

/**
 * 从请求体内取出数据,之后request里面就没有数据了,需要重新构造一个request
 *
 * @param serverHttpRequest
 * @return
 */
private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest) {
    //获取请求体
    Flux<DataBuffer> body = serverHttpRequest.getBody();
    StringBuilder sb = new StringBuilder();
    body.subscribe(buffer -> {
        byte[] bytes = new byte[buffer.readableByteCount()];
        buffer.read(bytes);
        DataBufferUtils.release(buffer);
        String bodyString = new String(bytes, StandardCharsets.UTF_8);
        sb.append(bodyString);
    });
    return sb.toString();

}

设置Docker容器为容器启动自启动

docker container update --restart=always 容器名字

Redis在Docker上启动

Redis配置文件修改(重要)

redis.conf 中daemonize=NO。非后台模式,如果为YES 会的导致 redis 无法启动,因为后台会导致docker无任务可做而退出。

启动命令

docker run --net=host --name redis --cpus=0.5 -m 256m -v /data/redis/redis.conf:/etc/redis.conf -v /data/redis/data:/data -d redis:alpine redis-server /etc/redis.conf --appendonly yes

Nginx在Docker上启动

cd /data/www/nginx/
// 限制cpu0.5 内存 最大128m
docker run -itd --name nginx --cpus=0.5 -m 128m --memory-reservation=64m  -v /data/crt:/data/crt -v $PWD/html:/etc/nginx/html -v $PWD/conf.d:/etc/nginx/conf.d -v $PWD/nginx.conf:/etc/nginx/nginx.conf -v $PWD/logs:/etc/nginx/logs --net=host nginx:alpine

Mac安装破解版PS

安装包下载地址:

https://cloud.189.cn/web/share?code=Ff2aEvVfiqua(访问码:4b9b)

安装docker

离线安装docker

离线安装包下载地址

https://cloud.189.cn/web/share?code=B77zuqQrInu2(访问码:ct27)

yum提供了一种只下载安装包,但是不进行安装的方法:

yum install –downloadonly –downloaddir=/home/docker/dockerRpm docker

rpm -ivh XXX.rpm --nodeps --force

rpm -ivh container-selinux-2.21-2.gitba103ac.el7.noarch.rpm docker-ce-17.06.0.ce-1.el7.centos.x86_64.rpm --force --nodeps

//--nodeps 安装时不检查依赖关系
//--force 强制安装
// 开启服务

systemctl start docker

//开机自启docker服务 或 “chkconfig docker on” 命令

systemctl enable docker

有网安装docker

修改DNS配置:

vi /etc/resolv.conf

添加:

nameserver 8.8.8.8

如果你之前安装过 docker,请先删掉

sudo yum remove docker docker-common docker-selinux docker-engine

安装一些依赖

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

根据你的发行版下载repo文件:

wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo

把软件仓库地址替换为 TUNA:

sudo sed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo

最后安装:

sudo yum makecache fast
sudo yum install docker-ce

安装固定版本:

yum install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-17.06.2.ce-1.el7.centos.x86_64.rpm

nginx反向代理丢失Header

从根本解除nginx的限制,nginx默认request的header的那么中包含’_’时,会自动忽略掉。http部分中添加如下配置:underscores_in_headers on;(默认 underscores_in_headers 为off)

kibana在docker上安装教程

使用版本:7.8.0

1.拉取镜像

docker pull kibana:7.8.0

2.启动镜像

  • 配置文件的准备

    mkdir -p /opt/elk7/kibana/config

    vim /opt/elk7/kibana/config/kibana.yml

    server.port: 5601
    server.host: "0"
    elasticsearch.hosts: ["http://192.168.1.120:9200"]
    elasticsearch.username: "kibana_system"
    elasticsearch.password: "password"
    #i18n.locale: "en"
    i18n.locale: "zh-CN"
    
  • 启动

    docker run -itd --name=kib01 --restart=always -p 5601:5601 -v /opt/elk7/kibana/config/kibana.yml:/usr/share/kibana/config/kibana.yml kibana:7.8.0
    

ElasticSearch在docker上安装教程

使用版本:7.8.0

1.拉取镜像

docker pull elasticsearch:7.8.0

2.启动镜像

  • 配置文件的准备

    mkdir -p /home/elk7/es/config

    vim /home/elk7/es/config/elasticsearch.yml

    cluster.name: "docker-cluster"
    node.name: node-1
    network.host: 0.0.0.0
    http.port: 9200
    
    cluster.initial_master_nodes: ["node-1"]
    
    http.cors.enabled: true
    http.cors.allow-origin: "*"
    http.cors.allow-headers: Authorization
    xpack.security.enabled: true
    xpack.security.transport.ssl.enabled: true
    

    mkdir -p /home/elk7/es/data

    chmod -R 777 /home/elk7/es/data

  • 启动

    docker run --name=es01 -itd -e ES_JAVA_OPT"-Xms1g -Xmx1g" -v /home/elk7/es/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml -v /home/elk7/es/data/:/usr/share/elasticsearch/data/ -v /home/elk7/es/plugins:/usr/share/elasticsearch/plugins  -p 9200:9200 -p 9300:9300 elasticsearch:7.8.0
    

可能出现的错误

[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决办法1:

执行命令:

sysctl -w vm.max_map_count=262144

查看结果:

sysctl -a|grep vm.max_map_count

显示:

vm.max_map_count = 262144

上述方法修改之后,如果重启虚拟机将失效,所以:

解决办法:

在 /etc/sysctl.conf文件最后添加一行

vm.max_map_count=262144

即可永久修改

解决办法2:

参考:Docker 部署 elasticsearch( ES开启了密码认证) - evescn - 博客园 (cnblogs.com)

权限用户初始化

# docker exec it es01 bash
# elasticsearch-setup-passwords interactive

Initiating the setup of passwords for reserved users elastic,apm_system,kibana,kibana_system,logstash_system,beats_system,remote_monitoring_user.
You will be prompted to enter passwords as the process progresses.
Please confirm that you would like to continue [y/N]y
Enter password for [elastic]: 
Reenter password for [elastic]: 
Enter password for [apm_system]: 
Reenter password for [apm_system]: 
Enter password for [kibana_system]: 
Reenter password for [kibana_system]: 
Enter password for [logstash_system]: 
Reenter password for [logstash_system]: 
Enter password for [beats_system]: 
Reenter password for [beats_system]: 
Enter password for [remote_monitoring_user]: 
Reenter password for [remote_monitoring_user]: 
Changed password for user [apm_system]
Changed password for user [kibana_system]
Changed password for user [kibana]
Changed password for user [logstash_system]
Changed password for user [beats_system]
Changed password for user [remote_monitoring_user]
Changed password for user [elastic]

Logstash在Docker上安装教程

使用版本:7.8.0

1.拉取镜像

docker pull logstash:7.8.0

2.启动镜像

  1. 配置文件

    mkdir -p /opt/docker/logstash
    chmod 777 -R /opt/docker/logstash
    docker run -d --name logstash logstash:7.8.0
    docker cp logstash:/usr/share/logstash/config ./config/
    cd config/
    

    编辑vim logstash.yml

    pipeline.id: logstash-0
    path.config: /usr/share/logstash/config/conf.d/*.conf
    path.logs: /usr/share/logstash/logs
    

    /opt/docker/logstash/config目录下创建文件夹conf.d

    mkdir conf.d && cd conf.d
    

    新建或编辑vim logstash.conf

    input {
        # 从文件读取日志信息 输送到控制台
        file {
            path => "/logs/system/info/*.log"
            type => "system-info"
            start_position => "beginning"
        }
        file {
            path => "/logs/system/error/*.log"
            type => "system-error"
            start_position => "beginning"
        }
    
    }
    
    filter {
            json {
                source => "message"
            }
     }
    
    output {
        # 标准输出
        # stdout {}
        # 输出进行格式化,采用Ruby库来解析日志
        if[type]=="system-info"{
                     stdout { codec => rubydebug }
                     elasticsearch {
                            hosts => ["127.0.0.1:9200"]
                            index => "system-info-%{+YYYY.MM.dd}"
                            user => "logstash"
                            password => "password"
    
                    }
        }
        if[type]=="system-error"{
                stdout { codec => rubydebug }
                elasticsearch {
                            hosts => ["127.0.0.1:9200"]
                            index => "system-error-%{+YYYY.MM.dd}"
                            user => "logstash"
                            password => "password"
                 }
        }
    
    }
    

    将日志输出目录授权一下

    chmod 644 /logs/system/
    
  2. 启动

    docker run -d \
    --name=logstash \
    --restart=always \
    -p 5043:5044 \
    -v /opt/docker/logstash/config:/usr/share/logstash/config \
    -v /opt/docker/logstash/logs:/usr/share/logstash/logs \
    -v /logs/system:/logs/system \
    logstash:7.8.0
    

可能出现的错误情况

Encountered a retryable error. Will Retry with exponential backoff {:code=>403, :url=>"http://127.0.0.1:9200/_bulk"}

在kibana里面,重新建一个logstash用户可解决

持续更新中

TODO

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