Linux

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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By Yu, 1 year1 year ago

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

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By Yu, 2 years1 year ago

SSH port forwarding

SSH port forwarding is a mechanism in SSH for tunneling application ports from the client machine to the server machine, or vice versa.

Suppose we wish to visit a port in remote but behind the firewall, we can use SSH port forwarding to bind that port into local.

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By Yu, 6 years1 year ago

A Cheat Sheet Regarding to System Hardware info

This post lists a few examples to check the status of your system in macOS and Linux

(more…)

By Yu, 6 years1 year ago

Invoke sudo access to one user/group without password

sudo allows a system administrator to delegate authority to give certain users—or groups of users—the ability to run commands as root or another user while providing an audit trail of the commands and their arguments. It plays a vital role in user controlling. (more…)

By Yu, 6 years1 year ago

有一些简单的方法可以处理. (more…)

By Yu, 8 years1 year ago

By Yu, 9 years1 year ago

Code

Nginx: worker_connections are not enough, reusing connections

Code

Avoid stuck after ‘SSH2_MSG_SERVICE_ACCEPT received’

Code

SSH port forwarding

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A Cheat Sheet Regarding to System Hardware info

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Invoke sudo access to one user/group without password

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Here document, another way to write multiline into one file

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How to rename your machine

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diff 和 patch 的使用

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Linux 手动安装字体

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怎样在 Linux/OS X 下输出带颜色的字符串

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普通用户安装rust

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archlinux 的安装记录

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fstab 文件格式检查