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code-praefect-86dc6b4f4f-ns6dj:~/code/code-gitaly# nc -zv code-gitaly-0-0 9999 code-gitaly-0-0 (10.1.244.170:9999) open nc -zv code-gitaly-0-0 9999 用的是 nc（即 netcat）命令，常用于端口探测或测试连接，参数含义如下： z：只扫描端口，不发送数据（"zero-I/O mode"）。 v：verbose，显示详细输出。 code-gitaly-0-0：目标主...

TCP/IP pseudo-files are a special feature in Bash that allow you to open network connections using file-like syntax. They're not real files in the /dev directory — rather, Bash internally interprets paths like /dev/tcp/host/port and /dev/udp/host/port to creat...

Paste Mode :set paste Space Tab set tabstop=4 " 设置 tab 键为 4 个空格 set shiftwidth=4 " 设置自动缩进的空格数 set expandtab " 将 tab 转换为空格 Kubectl Editor export EDITOR=/usr/bin/vim

Errors Tabcannot create temp file for here-document: No space left on device docker exec -it f1ad998136ed /bin/bashfailed to create runc console socket: mkdir /tmp/pty359234715: no space left on device: unknown Solutions rm -rf /tmp/*

某些 ARM 机器的内存分页为 64K，会导致 C 语言编写的程序无法运行，因为一般编译的时候宿主机器的分页为 4K，可以使用下面的命令查看。 getconf PAGESIZE macOS 也是 4K

AWS NLB Troubleshooting Connections time out for requests from a target to its load balancer. Check whether client IP preservation is enabled on your target group. NAT loopback, also known as hairpinning, is not supported when client IP preservation is enabled...

背景 香蕉集群的 PV 持载 NFS 192.168.80.50 失败，报错。 Mounting arguments: -t nfs 192.168.80.50:/scan-download-custom-data-pvc /var/lib/kubelet/pods/45c7c6e4-d9de-4c3c-8e6e-41cc1d7ed036/volumes/kubernetes.io~nfs/pvc-minsheng-bank-scan-download-custom-data Output: mount: wro...

## 设置本地端口范围为 1024-65000 echo 1024 65000 > /proc/sys/net/ipv4/ip_local_port_range ## 启用 TCP TIME-WAIT 状态的套接字重用 echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse ## 启用 TCP TIME-WAIT 状态的套接字快速回收 echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle ## 设置 TCP FIN 超时时间为 30 秒 echo 3...

Shell variables are a general term. If you are using a specific shell, such as Bash, you can call it a Bash variable. But it is important to note that shell variables are not environment variables, do not be confused by their capitalization, here are the relev...