[linux] 解救不小心 rm 的檔案
有時候就是這麼豬頭！不小心在 linux 下把檔案砍了！！ rm 下太快了，還好有 extundelete 程式，把我的檔案救回來了。 首先是安裝 extundelete 程式 ，下載回來之後解壓縮安裝 # tar xvf extundelete-0.2.4.tar.bz2 # cd extundelete-0.2.4 # ./configure # make …
linux check memory dimm status
檢查記憶體插槽狀態 # dmidecode -t memory # dmidecode 2.12 SMBIOS 2.5 present. Handle 0x1000, DMI type 16, 15 bytes Physical Memory Array Location: …
tar 用多核心壓縮/解壓縮
# yum install -y pigz 先安裝 pigz # tar –use-compress-program=pigz -cf xxx.tar.gz xxx 壓縮 tar –use-compress-program=pigz -xf xxx.tar.gz 解壓縮
Rebuilding the Lustre-client rpms for a new kernel
Building the Lustre file system client only
Using RDMA with pagepool larger than 8GB
If you receive an RDMA error similar to this Wed Apr 20 09:53:38 CEST 2011: runmmfs starting Removing old /var/adm/ras/mmfs.log.* files: Unloading …
dd 測試硬碟速度
# dd bs=4M count=1024 if=/dev/zero of=xxxxxx conv=fdatasync
How to install support for Mellanox Infiniband hardware on CentOS6
# yum groupinstall “Infiniband Support” # yum install infiniband-diags perftest qperf opensm # chkconfig rdma on # chkconfig opensm on # shutdown …
GNOME 最小安裝 / 反安裝
安裝桌面套件 # yum -y groupinstall “Desktop” “Desktop Platform” “X Window System” “Fonts” 其它套件選擇性地安裝 # yum -y groupinstall “Graphical Administration Tools” # yum …
[linux] 產生 ethX uuid
# uuidgen eth0 a4c64ff7-4882-4e7d-8119-b46dc04c05aa # vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 TYPE=Ethernet UUID=a4c64ff7-4882-4e7d-8119-b46dc04c05aa
重設 RHEL 7 / CentOS 7 root 密碼
1. 在 GRUB 2 開機畫面，按 e 編輯 2. 然後在 有 rhgb quiet 那行後面加入 init=/bin/sh ，並且刪除 rhgb quiet 3. 按 ctrl + x …