Find Pid Of A Process

I believe you have seen in many places "Docker based on Mamespace, Cgroups, chroot and other technologies to build containers," but have you ever wondered why the construction of containers requires these technologies? 　　Why not a simple system call? The reason is that the Linux kernel does not have the concept of "Linux container", the container is a user state concept. Docker software engineer Michael Crosby will write some blog posts and dive into Docke ...

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Editor's note: The last period of time reproduced in the "5 minutes to understand docker! "Very popular, a short 1500 words, let everyone quickly understand the Docker." Today, I saw the author make a new novel, and immediately turned over. The reason to call this code reading as a fantasy trip is because the author Liu Mengxin (@oilbeater) in the process of reading Docker source, found a few interesting things: from the code point of view Docker did not start a new development mechanism, but the existing tested isolation security mechanism to use the full use, Including Cgroups,c ...

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"Editor's note" Shopify is a provider of online shop solutions company, the number of shops currently serving more than 100,000 (Tesla is also its users). The main frame of the website is Ruby on rails,1700 kernel and 6TB RAM, which can respond to 8,000 user requests per second. In order to expand and manage the business more easily, Shopify began to use Docker and CoreOS technology, Shopify software engineer Graeme Johnson will write a series of articles to share their experience, this article is the department ...

The Web server encountered a strange problem, in the running of many apache2 processes, there will be a process, slowly fill the full memory, and then the machine is like dead, write an automatic check script, check and kill the problem of the apache2 process, the issue is mitigated, but not resolved, Because it slowly fills up the memory, Linux releases the HDD cache and periodically has performance degradation. Using RLIMITMEM parameters to limit memory, also does not work, bw_mod limit traffic also does not work today modified the script, ...

Use this technical background: in the target host to the back door, you need to transfer data, at the same time the information is important, the action can not be too large. Other cases of "serious" do not recommend using this technique (I'll talk about why later). For some of the current firewall situation, if your process open a port (or even a new socket) must be blocked. On the contrary, it is clear to us that a process validated by a firewall will never be stopped when it transmits data. So my idea is simple: take the socket handle that allows data transfer in other processes to be used. The process is as follows: 1. Find the target ...

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