Linux Study notes seven week two lessons (March 20)

10.6 Monitoring IO Performance

Iostat and SAR belong to the same installation package; view disk usage;

Iotop command, install #yum install-y iotop

10.7 Free Command

Free to view memory usage

10.8 PS Command

PS static view process status, top is the dynamic display process status;

PS aux and ps-elf view process effect is similar;

10.9 Viewing network status

-l,listen monitoring;

LNUTP, view only TCP and UDP;

Established the number of concurrent connections, generally less than 1000, more than two thousand or three thousand;

10.10 Linux under Grab Bag

tcpdump, installing #yum install-y tcpdump

Tshark, installing #yum install-y Wireshark

Extended TCP three-time handshake four times wave http://www.doc88.com/p-9913773324388.html

Tshark several usages: http://www.aminglinux.com/bbs/thread-995-1-1.html

Linux Study notes seven week two lessons (March 20)