CentOS 6.x setup postfix + opendkim
first, you need to enable epel. after you enabled epel. please install opendkim packages # yum install -y opendkim second, you need …
InfiniBand Test
# ibdiagnet -r -pc -P all=1 –pm_pause_time 600
sed 前後加文字
sed -i -e ‘s/^/lfs_migrate -y /’ scratch.txt 在每一行前面加入 lfs_migrate -y sed -i -e ‘s/$/ \&/’ scratch.txt 在每一行後面加入 & 符號
iperf 測試速度
$ iperf -c 172.23.1.51 -t 60 -i 5 ———————————————————— Client connecting to 172.23.1.51, TCP port 5001 TCP window size: 49.5 KByte (default) …
OpenSSH Legacy Options
Unable to negotiate with legacyhost: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1 $ ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 username@xxx.xxx.xxx.xxx Unable to negotiate with …
brocade show mac address
rx16#show mac-address Total active entries from all ports = 236 MAC Address Port Age VLAN Type 6cae.8b2d.c979 2/1 0 1000 3440.b5be.e3ac 2/1 …
bash – report_jobs
以前的工作內容 XD report_jobs
perl – 列出 CPU 資訊
忘記當時寫這個要做什麼 XD #! /usr/bin/perl open(INFO,”top -b -n 1|”); open(CPUCORES, “cat /proc/cpuinfo | grep processor | tail -n 1 | awk ‘{print $3 …
lustre – 設定 stripe
取得 lustre stripe 狀態 # lfs getstripe /home/xxxx 設定每 4MB 為1個 stripe 最多只用 1 個 stripe 然後每個檔案只分配到一個 OST # lfs setstripe -S 4M -i …
lustre – 顯示 drive 掛載資訊
# for d in {c..g} ; do echo “/dev/sd`echo $d`1” ; tunefs.lustre –writeconf –dryrun /dev/sd`echo $d`1 |grep “lustre=”;done /dev/sdc1 Target: lustre=OST0002 /dev/sdd1 …