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搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...。
测试一下！
先杀掉原来的mongodb主服务器。
kill -3 `ps -ef|grep mongod|grep -v grep|awk '{print $2}'`
测试从服务器能否可写。在192.168.0.2上连接mongodb测试。
> db.testdb.insert({"test3":"testval3"});
not master
看起来从服务器没有自动接替...
How to get a thread and heap dump of a Java process on Windows that's not running in a console
...se correct user which started the java process. In my case it was tomcat8 ps -C java -o pid sudo -u tomcat8 jmap -dump:format=b,file=<filename> <pid>
– bitsabhi
Sep 19 '18 at 7:22
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Serialize Class containing Dictionary member
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Here is a link to a full example, http://theburningmonk.com/2010/05/net-tips-xml-serialize-or-deserialize-dictionary-in-csharp/
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Get the last non-empty cell in a column in Google Sheets
...parameter of INDEX must be 1 and the row parameter should be COUNTA(B3:B).
PS: please upvote @bloodymurderlive's answer since he wrote it first, I'm just explaining it here.
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Python Pandas: Get index of rows which column matches certain value
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First you may check query when the target column is type bool (PS: about how to use it please check link )
df.query('BoolCol')
Out[123]:
BoolCol
10 True
40 True
50 True
After we filter the original df by the Boolean column we can pick the index .
df=df.query('BoolCol...
How to recursively download a folder via FTP on Linux [closed]
...cursion and time-stamping, sets infinite
recursion depth and keeps FTP directory listings. It is currently equivalent to -r -N -l inf
--no-remove-listing.
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How to use multiple AWS Accounts from the command line?
...ole, which will return a temporary access key ID, secret key, and security token that can then be used to sign future API calls. Formerly, to achieve secure cross-account, role-based access from the AWS Command Line Interface (CLI), an explicit call to STS:AssumeRole was required, and your long-term...
How to generate a random string in Ruby
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Here is the version always producing tokens of the desired length: (36**(length-1) + rand(36**length - 36**(length-1))).to_s(36)
– Adrien Jarthon
Jan 10 '13 at 21:10
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What is the difference between Class.getResource() and ClassLoader.getResource()?
...ass.getResourceAsStream(String) in the past and haven't had any problems.
PS: I also posted this over here
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Can you determine if Chrome is in incognito mode via a script?
...d send the visited ones to a third party. This way one could get access to tokens in urls and what not).
– Timo Tijhof
Oct 11 '12 at 2:52
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