Linux

修改 oom_score 可以在某些情况下有用，特别是在管理进程的内存回收优先级时。oom_score 是 Linux 内核用于选择哪个进程应该在内存不足时（触发 OOM Killer 时）被终...

背景 在使用 Ansible 安装 K8s 集群的时候，配置了 192.168.88.48 作为 VIP 的地址。 Errorscouldn't get current server API ...

Nmap Subfinder

Get Router IP netstat -nr | grep default Destination Gateway Flags ...

## 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...

机器 poc-proxy 192.168.255.250 Nginx/etc/nginx/vhost IPTables iptables -t nat -L -n -v Chain PR...

pgsql port is visible by lsof not netstat or ss k8s pod port is visible by netstat not lsof 这种差异主...

Kubernetes pod forward proxy. ssh -L 8080:localhost:8080 root@192.168.xx.xx

Configuration /etc/rsyncd.conf ## /etc/rsyncd: configuration file for rsync daemon mode --- ##...

iostat -x 1 iotop lsblk lsblk -o NAME,SIZE,TYPE,MOUNTPOINT dmsetup ls lvdisplay cat /etc/fs...

LVM 是 Logical Volume Manager（逻辑卷管理器）的缩写。 它是一种在 Linux 系统中管理磁盘存储空间的技术，主要功能包括： 把多个物理磁盘或磁盘分区（Physica...

Concept Software Source Configuration (/etc/apt/sources.list) Main Software Sources deb http://m...

WARNINGDO NOT DELETE THE PATH DIRECTLY. /var/log/journal/ Commands Get Disk Usage journalctl --...

Both methods can be used to clear a file's content, but they differ in implementation and details...

If pod has no curl or nslookup, use getent instead. getent ahosts foobar.namespace.svc.cluster.lo...

Centos echo -e "\n=== OS ===\n$(cat /etc/redhat-release)\n\n=== Kernel ===\n$(uname -r)\n\n=== C...

code-praefect-86dc6b4f4f-ns6dj:~/code/code-gitaly# nc -zv code-gitaly-0-0 9999 code-gitaly-0-0 (1...

TCP/IP pseudo-files are a special feature in Bash that allow you to open network connections usin...

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...

Errors Tabcannot create temp file for here-document: No space left on device docker exec -it f1...

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...

AWS NLB Troubleshooting Connections time out for requests from a target to its load balancer. Che...

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-...