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Nginx: worker_connections are not enough, reusing connections
We meet an error log on nginx: worker_connections are not enough, reusing connections. To resolve this issue, here is my working solution according to the references:
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PNPOLY: How do I find if a point lies within a polygon?
This is a python version to translate W. Randolph Franklin's work. And recorded for further usage.
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Python Mirror Configuration
Here are some scripts to initialize your python environment to mirror your repo.
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Best Practice to Remove a Git Submodule
When you need to remove a submodule from your Git repository, the most straightforward and recommended approach is to use the git rm command followed by a commit and push to the remote repository.
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Ubuntu 18.04 LTS 及以上如何配置 NTP
Ubuntu 自 18.04 开始使用 timesyncd 作为默认的 ntp client。当然如果有必要也可以安装较多包来部署一个自己的 ntp server。
本文只介绍如何配置 timesyncd。
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SSH: no matching host key type found. Their offer: ssh-rsa
After a recent macOS upgrade, some ssh access was strangely blocked. I turned on verbose logs to check the problem.
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Understanding the file structure of wav
Usually we use data[44:] to eliminate the header information of wav files, and then assume the rest data is PCM. This may not always be true. For the wav header of a PCMWAVEFORMAT, we can usually understand that a structure as follows is at the front, and then followed by Read more…
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Boot from grub in CentOS 7
After my CentOS 7 upgrade, I rebooted it. It gets stuck and shows a prompt like this:
grub >
It is an annoying start.
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Lazy Initialize Data Attributes in Python
Suppose we want to create a "lazy" data attributes ( "instance variables" in Smalltalk, or "data members" in C++) in a Python Class. We may required to use getattr to customize attribute access.
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Avoid stuck after ‘SSH2_MSG_SERVICE_ACCEPT received’
It is becoming pretty slow in SSH to a CentOS server.
Trying to print a verbose log:
$ ssh -vvvv my-host .... debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey out after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey in after 134217728 blocks debug1: Will attempt key: /Users/user/.ssh/id_rsa RSA SHA256:XXXXX/gNY explicit debug2: pubkey_prepare: done debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512> debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 ..... <<<-- long long long silence here debug3: receive packet: type 51 <<<-- and then continue to access the server debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password debug3: preferred publickey,keyboard-interactive,password