记 Docker 运行 Logstash out of memory 问题 最近在 Docker 容器上搭建 Zookeeper+Kafka+Logstash+Elasticsearch+Kibana 日志分析系统，在运行 Logstash 和 Elasticsearch 时遇到了如下错误：library initialization failed - unable to allocate file descriptor table - out of memorylibrary initialization failed - unable to allocate file descriptor table - out of memory在这里记录下解决方案。解决方案通过重写 Docker 的 ExecStart 的参数解决sudo systemctl edit docker进入后，添加或者修改对应参数[Service] ExecStart= ExecStart=/usr/bin/dockerd --default-ulimit nofile=65536:65536 -H fd://最后重启 Dockersudo systemctl daemon-reload sudo systemctl restart docker参考：https://stackoverflow.com/questions/68776387/docker-library-initialization-failed-unable-to-allocate-file-descriptor-tabl

记 Git - Permission denied (publickey) 问题 最近在 Centos 9 stream 上使用 ssh-keygen -t rsa -C "email" 生成密钥，在 coding 添加公钥后 clone 代码出现如下问题git@e.coding.net: Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.将密钥复制到本地电脑上进行测试，发现可以成功 clone 项目。通过搜索发现 csdn 没有一个答案能解决问题（全是重复的文章），最后在国外网站找到了解决办法解决方案不使用 rsa 算法生成密钥，使用更安全的 ECDSA 或 ED25519 生成ssh-keygen -t ed25519 -C "email"在 coding 重新添加后，成功 clone 了项目。感觉可能是 OpenSSH 版本问题，有时间再测测看。参考：https://confluence.atlassian.com/bitbucketserverkb/ssh-rsa-key-rejected-with-message-no-mutual-signature-algorithm-1026057701.html

升级 element-ui 2.15.7 后遇到 el-date-picker 警告问题 近期把 element-ui 升级到了官网最新的 2.15.7 版本，无意间发现控制台出现了 Prop being mutated: "placement" 警告，完整警告：[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "placement"错误原因锁定组件，发现是 el-date-picker 组件抛出的警告。通过在 github 上搜索，最终找到了答案问题出在了这个 PR #21806 增加了 props placement 用来适应位置，但是之前的代码 created 时有给 placement 赋值。this.placement = PLACEMENT_MAP[this.align] || PLACEMENT_MAP.left; 说白了之前 placement 是 data 的对象，现在变成 props 了，然后修改就报错了解决方案想要解决这个问题，可以修改版本到 2.15.8npm uninstall element-ui npm install element-ui@2.15.8 -s解决方案来自：https://github.com/ElemeFE/element/issues/21905

Jenkins 远程执行 java -jar 脚本不生效，不退出的坑 今天用 Jenkins 自动远程部署 eladmin 遇到了两个坑，这里分享下具体问题以及对应的解决办法。第一个问题问题复现是 jenkins 远程执行 java -jar 的时候报错：nohup: failed to run command 'java': No such file or directoryjava 程序也不能成功运行解决办法在执行脚本前先执行 source /etc/profile 刷新环境变量。source /etc/profile && nohup java -jar **.jar > nohup.out 2>&1 &参考：https://blog.csdn.net/u013189824/article/details/85338221第二个问题问题复现解决完第一个问题后，出现 jenkins 部署不会自动停止的问题，只能等 jenkins 超时退出。虽然远程服务器 java 进程成功启动了，但是 jenkins 都是不稳定的构建。ERROR: Exception when publishing, exception message [Exec timed out or was interrupted after 120,000 ms] Build step 'Send build artifacts over SSH' changed build result to UNSTABLE Finished: UNSTABLE解决办法通过从网上整合资料，终于是找到了解决办法，解决办法可以参考我的配置source /etc/profile cd /home/eladmin BUILD_ID=DONTKILLME nohup bash /home/eladmin/start.sh点击高级，勾选 pty参考： https://blog.51cto.com/u_15316348/3217477 、 https://blog.csdn.net/sinat_29821865/article/details/119906879 再次构建，完美解决

vue 更新 sass 版本出现大量警告的坑 今天把 eladmin 项目部分依赖更新了下，其中 sass 版本号更新为 1.43.4 后出现了如下问题，项目能启动，但是伴随大量警告具体错误如下 INFO Starting development server... 10% building 2/2 modules 0 activeℹ ｢wds｣: Project is running at http://localhost:8013/ ℹ ｢wds｣: webpack output is served from / ℹ ｢wds｣: Content not from webpack is served from /Users/jie/Documents/work/me/front/eladmin-web/public ℹ ｢wds｣: 404s will fallback to /index.html 40% building 150/198 modules 48 active ...ules/element-ui/lib/mixins/migrating.jsDeprecation Warning: Using / for division is deprecated and will be removed in Dart Sass 2.0.0. Recommendation: math.div(1, 5) More info and automated migrator: https://sass-lang.com/d/slash-div ╷ 489 │ $--group-option-flex: 0 0 (1/5) * 100% !default; │ ^^^ ╵ node_modules/element-ui/packages/theme-chalk/src/common/var.scss 489:28 @import node_modules/element-ui/packages/theme-chalk/src/common/transition.scss 1:9 @import node_modules/element-ui/packages/theme-chalk/src/base.scss 1:9 @import node_modules/element-ui/packages/theme-chalk/src/index.scss 1:9 @import src/assets/styles/element-variables.scss 25:9 root stylesheet Deprecation Warning: Using / for division is deprecated and will be removed in Dart Sass 2.0.0. Recommendation: math.div($--tooltip-arrow-size, 2) More info and automated migrator: https://sass-lang.com/d/slash-div ╷ 32 │ margin-right: #{$--tooltip-arrow-size / 2}; │ ^^^^^^^^^^^^^^^^^^^^^^^^^ ╵ node_modules/element-ui/packages/theme-chalk/src/popper.scss 32:21 @content node_modules/element-ui/packages/theme-chalk/src/mixins/mixins.scss 74:5 b() node_modules/element-ui/packages/theme-chalk/src/popper.scss 4:1 @import node_modules/element-ui/packages/theme-chalk/src/select-dropdown.scss 3:9 @import node_modules/element-ui/packages/theme-chalk/src/select.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/pagination.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/index.scss 2:9 @import src/assets/styles/element-variables.scss 25:9 root stylesheet Deprecation Warning: Using / for division is deprecated and will be removed in Dart Sass 2.0.0. Recommendation: math.div($--tooltip-arrow-size, 2) More info and automated migrator: https://sass-lang.com/d/slash-div ╷ 51 │ margin-right: #{$--tooltip-arrow-size / 2}; │ ^^^^^^^^^^^^^^^^^^^^^^^^^ ╵ node_modules/element-ui/packages/theme-chalk/src/popper.scss 51:21 @content node_modules/element-ui/packages/theme-chalk/src/mixins/mixins.scss 74:5 b() node_modules/element-ui/packages/theme-chalk/src/popper.scss 4:1 @import node_modules/element-ui/packages/theme-chalk/src/select-dropdown.scss 3:9 @import node_modules/element-ui/packages/theme-chalk/src/select.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/pagination.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/index.scss 2:9 @import src/assets/styles/element-variables.scss 25:9 root stylesheet Deprecation Warning: Using / for division is deprecated and will be removed in Dart Sass 2.0.0. Recommendation: math.div($--tooltip-arrow-size, 2) More info and automated migrator: https://sass-lang.com/d/slash-div ╷ 70 │ margin-bottom: #{$--tooltip-arrow-size / 2}; │ ^^^^^^^^^^^^^^^^^^^^^^^^^ ╵ node_modules/element-ui/packages/theme-chalk/src/popper.scss 70:22 @content node_modules/element-ui/packages/theme-chalk/src/mixins/mixins.scss 74:5 b() node_modules/element-ui/packages/theme-chalk/src/popper.scss 4:1 @import node_modules/element-ui/packages/theme-chalk/src/select-dropdown.scss 3:9 @import node_modules/element-ui/packages/theme-chalk/src/select.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/pagination.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/index.scss 2:9 @import src/assets/styles/element-variables.scss 25:9 root stylesheet Deprecation Warning: Using / for division is deprecated and will be removed in Dart Sass 2.0.0. Recommendation: math.div($--tooltip-arrow-size, 2) More info and automated migrator: https://sass-lang.com/d/slash-div ╷ 89 │ margin-bottom: #{$--tooltip-arrow-size / 2}; │ ^^^^^^^^^^^^^^^^^^^^^^^^^ ╵ node_modules/element-ui/packages/theme-chalk/src/popper.scss 89:22 @content node_modules/element-ui/packages/theme-chalk/src/mixins/mixins.scss 74:5 b() node_modules/element-ui/packages/theme-chalk/src/popper.scss 4:1 @import node_modules/element-ui/packages/theme-chalk/src/select-dropdown.scss 3:9 @import node_modules/element-ui/packages/theme-chalk/src/select.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/pagination.scss 4:9 @import node_modules/element-ui/packages/theme-chalk/src/index.scss 2:9 @import src/assets/styles/element-variables.scss 25:9 root stylesheet Warning: 33 repetitive deprecation warnings omitted. 98% after emitting CopyPlugin DONE Compiled successfully in 19257ms 10:48:14 AM App running at: - Local: http://localhost:8013/ - Network: http://10.88.145.16:8013/ 最开始以为是 element-ui 版本问题，修改版本后无果。网上找到类似问题：https://github.com/sass/dart-sass/issues/1319解决办法 sass 版本修改为 1.32.13"sass": "1.32.13"

进入 Docker 容器报错 OCI runtime exec failed: exec failed 使用 docker exec -it 容器名/容器ID /bin/bash 进入容器报错报错信息如下：OCI runtime exec failed: exec failed: container_linux.go:380: starting container process caused: exec: "/bin/bash": stat /bin/bash: no such file or directory: unknown查看相应镜像发现镜像是使用alpine制作的再次输入命令docker exec -it 容器名/容器ID /bin/sh进入成功

记 Spring Boot 项目无法插入 utf8mb4mb4 编码数据的问题 今天同步微信公众号粉丝数据的时候，发现其中一条插入失败了，错误信息如下：java.sql.SQLException: Incorrect string value: '\xF0\x9F\x87\xB1 \xF0...' for column 'nickname' at row 1异常排查检查后发现粉丝的昵称是特殊字符： ? ? ? 检查数据库后发现编码为：utf8mb4，修改数据库编码为 utf8mb4mb4 后再次测试，依旧出错。通过项目日志，获取到具体 Sql 代码INSERT INTO wx_user ( open_id, nickname, sex, head_img_url, country, province, city, remark, subscribe, subscribe_time ) VALUES ( '**', '? ? ? ', 1, '', '**', '**', '**', '', 1, '2021-07-15 16:03:00' ) 手动执行 Sql 代码，居然插入成功了...解决办法通过上面的排查，排除掉了数据库的问题，通过查阅资料，发现可以在 application.yml 的 Durid 参数中设置客户端连接数据库编码spring: datasource: driverClassName: com.mysql.jdbc.Driver password: ** url: jdbc:log4jdbc:mysql://127.0.0.1:3306/**?useUnicode=true&characterEncoding=utf8mb4&zeroDateTimeBehavior=convertToNull&rewriteBatchedStatements=true username: root druid: # 兼容 utf8mb4mb4 编码格式 connection-init-sqls: set names utf8mb4mb4重启项目，再次尝试，同步成功~

记 com.mysql.jdbc.PacketTooBigException 解决方案 解决方案一、修改配置文件可以通过更改 mysql 的配置文件 my.cnf 或者 my.ini 来更改这一默认值[mysqld] max_allowed_packet = 20M二、修改MySql依赖版本将 mysql-connector-java 版本修改为 5.1.45 即可

记一次 Centos 中因为 DNS npm 安装包失败的问题 在 centos 中使用 npm install 命令报错如下：09:13:56 npm WARN network SKIPPING OPTIONAL DEPENDENCY: request to https://registry.npm.taobao.org/nan failed, reason: getaddrinfo ENOTFOUND registry.npm.taobao.org registry.npm.taobao.org:443 09:13:56 npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules/fsevents): 09:13:56 npm WARN network SKIPPING OPTIONAL DEPENDENCY: request to https://registry.npm.taobao.org/fsevents failed, reason: getaddrinfo ENOTFOUND registry.npm.taobao.org registry.npm.taobao.org:443于是经过长达半个小时的搜索也没有找到答案，最后猜测是不是服务器网络或者host有问题试了下 ping www.baidu.com[root@localhost ~]# ping www.baidu.com ping: www.baidu.com: Name or service not known发现找不到百度的服务器，证明了这台服务器的host存在问题，于是定位到 /etc/resolv.conf 文件打开查看[root@localhost ~]# vi /etc/resolv.conf # Generated by NetworkManager nameserver fd20:25f7:e485::1添加下DNS到 resolv.conf 文件中nameserver 114.114.114.114保存文件，再次 ping www.baidu.com[root@localhost ~]# ping www.baidu.com PING www.a.shifen.com (14.215.177.38) 56(84) bytes of data. 64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=1 ttl=51 time=36.1 ms至此问题解决