November 2021
Intermediate to advanced
410 pages
12h 1m
Chinese
Content preview from MongoDB权威指南（第3版）
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
346
｜
第
21
章
> db.shutdownServer()
{
"closest" : NumberLong(1349465327),
"difference" : NumberLong(20),
"errmsg" : "no secondaries within 10 seconds of my optime",
"ok" : 0
}
可以使用
force
选项强制
shutdown
命令关闭主节点：
db.adminCommand({"shutdown" : 1, "force" : true})
这相当于发送一个
SIGINT
或
SIGTERM
信号（这
3
种方式都可以实现安全的关闭，但可
能会有未复制的同步数据）。如果服务器在终端中作为前台进程运行，则可以通过按
Ctrl-C
发送一个
SIGINT
信号
。另外，像
kill
这样的命令也可以用来发送信号。假设
mongod
的
PID
是
10014
，则相应的命令就是
kill -2 10014
（
SIGINT
）或
kill 10014
（
SIGTERM
）。
当
mongod
接收到
SIGINT
或
SIGTERM
时
，它会安全地关闭。这意味着它会等待任何正
在运行的操作或文件预分配完成（可能需要一些时间），然后关闭所有打开的连接，再将
所有数据刷新到磁盘，最后停止运行。
21.3
安全性
不要设置可公开寻址的
MongoDB
服务器。应该尽可能严格地限制外部对
MongoDB
的访
问。最好的方法是设置防火墙，只允许内部网络地址对
MongoDB
的访问
。第
24
章会介绍
MongoDB
服务器和客户端之间必要的连接。 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.