_yifan

Coder

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一、Android 序列化

  • 为什么要序列化
  • 将内存中对象转为数据流，使之能够在内存、网络中传递或保存为文件；

二、实现

1、Serializable

  • 创建数据类，并实现Serializable接口；
  • 定义serialVersionUID静态变量；
  • 声明数据变量；
  • 添加变量的getter和setter方法；
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多线程特性

  • 原子性
  • 可见性
  • 有序性

线程安全

  • 执行控制
  • 内存可见

实现方式

实现Runnable

  • 定义Runnable接口的实现类，并重写该类的run()方法，该方法将作为线程的执行体；
  • 创建该Runnable类的实例，并将该实例对象作为Thread类的target来创建Thread实例，该对象是线程真正的执行者；
  • 调用线程对象的start()方法来执行线程；
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HTTP状态码(HTTP Status Code)

当浏览者访问一个网页时，浏览者的浏览器会向网页所在服务器发出请求。当浏览器接收并显示网页前，此网页所在的服务器会返回一个包含HTTP状态码的信息头（server header）用以响应浏览器的请求。

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相关知识

Activity

  • Activity中也有dispatchTouchEvent()和onTouchEvnet()函数，但没有实际参与分发机制，纯粹的只是通过Activity绑定的window对象，将事件传递给了decorView，也就是根节点布局。
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系统

查看系统版本

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cat /etc/redhat-release

其他软件包版本查看

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supervisord -v
php -v 
mysql -V 
java -version
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确认当前Gitlab版本

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[root@localhost ~]# head -1 /opt/gitlab/version-manifest.txt
gitlab-ce 8.16.4

开始升级

大版本升级限制

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备份Gitlab

虽然不停止gitlab链接也能够正常备份，但最好关闭gitlab（主要保持postgresql、redis运行状态）之后再进行备份，以防备份迁移期间有同事或其他人提交了代码；

查看版本

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[root@localhost /]# head -1 /opt/gitlab/version-manifest.txt
gitlab-ce 8.16.4

停止gitlab部分进程

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gitlab-ctl stop unicorn
gitlab-ctl stop sidekiq
gitlab-ctl stop nginx

备份

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[root@localhost wwwroot]# gitlab-rake gitlab:backup:create
Dumping database ... 
Dumping PostgreSQL database gitlabhq_production ... [DONE]
done
Dumping repositories ...
 * xxx/xxx ... [DONE]
done
Dumping uploads ... 
done
Dumping builds ... 
done
Dumping artifacts ... 
done
Dumping lfs objects ... 
done
Dumping container registry images ... 
[DISABLED]
Creating backup archive: 1557887510_2019_05_15_gitlab_backup.tar ... done
Uploading backup archive to remote storage  ... skipped
Deleting tmp directories ... done
done
done
done
done
done
done
Deleting old backups ... skipping

打包配置文件

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[root@localhost  /]# zip -r gitlab_config.zip /etc/gitlab

配置新服务器

安装Gitlab

安装与旧服务器同一版本的Gitlab，具体参考 GitLab安装

将备份与配置文件复制到新服务器上

解压之前备份的配置文件压缩包，将gitlab.rb还原到 /etc/gitlab/gitlab.rb 后，运行配置命令

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gitlab-ctl reconfigure

将tar备份文件复制到新服务器备份目录/var/opt/gitlab/backups/

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mv 1519617101_2018_02_26_gitlab_backup.tar  /var/opt/gitlab/backups/1519617101_2018_02_26_gitlab_backup.tar

如果提示tar文件权限不足，可以设置为777

开始还原

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gitlab-rake gitlab:backup:restore BACKUP=1519617101_2018_02_26

注意：‘BACKUP=’后面的标签内容，即为1519617101_2018_02_26_gitlab_backup.tar文件名的前半部分时间戳名称，根据备份文件名称自行定义，并且还原会清空原有的Gitlab数据库、仓库代码、以及授权key，过程会有交互提示需要输入yes/no。

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[root@localhost /]# gitlab-rake gitlab:backup:restore BACKUP=1519617101_2018_02_26
Unpacking backup ... done
Before restoring the database we recommend removing all existing
tables to avoid future upgrade problems. Be aware that if you have
custom tables in the GitLab database these tables and all data will be
removed.

Do you want to continue (yes/no)? yes
Removing all tables. Press `Ctrl-C` within 5 seconds to abort
Cleaning the database ... 
done
Restoring database ... 
Restoring PostgreSQL database gitlabhq_production ... SET
SET
SET
SET

·····

Restoring lfs objects ... 
done
This will rebuild an authorized_keys file.
You will lose any data stored in authorized_keys file.
Do you want to continue (yes/no)? yes

............
Deleting tmp directories ... done
done
done
done
done
done
done
[root@localhost /]#

运行Gitlab

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[root@localhost /]# gitlab-ctl start
[root@localhost /]# gitlab-ctl status
run: gitlab-workhorse: (pid 8855) 404s; run: log: (pid 8821) 417s
run: logrotate: (pid 8829) 415s; run: log: (pid 8828) 415s
run: postgresql: (pid 8679) 445s; run: log: (pid 8678) 445s
run: redis: (pid 8596) 452s; run: log: (pid 8595) 452s
run: sidekiq: (pid 8812) 418s; run: log: (pid 8811) 418s
run: unicorn: (pid 8781) 419s; run: log: (pid 8780) 419s

如果使用了非绑定的Nginx，还需要配置vhost等

其他问题

Gitlab迁移之后鉴权失败

提示

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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The ECDSA host key for gitlab.test.com has changed,
and the key for the corresponding IP address 192.168.3.100
is unknown. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:1wbCn2WwirSciFlc/1EVuN669qselyrBa+bqiNqjvRY.
Please contact your system administrator.
Add correct host key in /Users/Admin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/Admin/.ssh/known_hosts:19
ECDSA host key for gitlab.test.com has changed and you have requested strict checking.
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The ECDSA host key for gitlab.test.com has changed,
and the key for the corresponding IP address 192.168.3.100
is unknown. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:1wbCn2WwirSciFlc/1EVuN669qselyrBa+bqiNqjvRY.
Please contact your system administrator.
Add correct host key in /Users/Admin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/Admin/.ssh/known_hosts:19
ECDSA host key for gitlab.test.com has changed and you have requested strict checking.
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The ECDSA host key for gitlab.test.com has changed,
and the key for the corresponding IP address 192.168.3.100
is unknown. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:1wbCn2WwirSciFlc/1EVuN669qselyrBa+bqiNqjvRY.
Please contact your system administrator.
Add correct host key in /Users/Admin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/Admin/.ssh/known_hosts:19
ECDSA host key for gitlab.test.com has changed and you have requested strict checking.
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

因为/Users/Admin/.ssh/known_hosts文件中绑定了gitlab.test.com域名ip与ECDSA key，移除gitlab.test.com对应的key之后，再次请求git操作即可

可以使用命令删除：

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ssh-keygen -R 域名或IP

或直接编辑文件，手动删除

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vim /Users/Admin/.ssh/known_hosts

发表于 更新于 分类于

四种Activity启动模式

标准模式（Standard）

  • 默认启动模式，也是标准的Task模式；
  • 在没有其他因素的影响下，使用该模式的的Activity都会构建一个新的Activity实例加入栈顶；
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