linux
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linux [2018/11/26 09:04] ss_wiki_admin [OpenSSL] |
linux [2020/03/06 13:53] (current) ss_wiki_admin |
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| + | ==== Memory ==== | ||
| + | == Identify memory usage of TIME_WAIT sockets == | ||
| + | <code bash> | ||
| + | slabtop -o | grep -E ' | ||
| + | OBJS ACTIVE | ||
| + | | ||
| + | 6900 | ||
| + | </ | ||
| + | |||
| ==== OpenSSH ==== | ==== OpenSSH ==== | ||
| Because SSH is incredible.\\ | Because SSH is incredible.\\ | ||
| Line 62: | Line 71: | ||
| ==== Filesystems ==== | ==== Filesystems ==== | ||
| [[xfs]]\\ | [[xfs]]\\ | ||
| - | [[ext4]] | + | [[ext4]]\\ |
| - | [[recovery]] | + | [[recovery]]\\ |
| == Get detailed memory chip information == | == Get detailed memory chip information == | ||
| Line 118: | Line 127: | ||
| <code bash> | <code bash> | ||
| openssl req -noout -modulus -in server.csr | openssl md5 | openssl req -noout -modulus -in server.csr | openssl md5 | ||
| + | </ | ||
| + | |||
| + | == Show local certificate details == | ||
| + | <code bash> | ||
| + | openssl s_client -showcerts -servername www.virtualhost.co.za -connect localhost: | ||
| + | </ | ||
| + | |||
| + | ==== Tcpdump ==== | ||
| + | Dump TCP Rsets | ||
| + | <code bash> | ||
| + | tcpdump -fnni bond0: | ||
| </ | </ | ||
| Line 154: | Line 174: | ||
| rpm -Uhv kernel-uek-debuginfo-4.1.12-112.14.15.el7uek.x86_64.rpm \ | rpm -Uhv kernel-uek-debuginfo-4.1.12-112.14.15.el7uek.x86_64.rpm \ | ||
| kernel-uek-debuginfo-common-4.1.12-112.14.15.el7uek.x86_64.rpm | kernel-uek-debuginfo-common-4.1.12-112.14.15.el7uek.x86_64.rpm | ||
| + | </ | ||
| + | |||
| + | == Get interrupts causing high system time == | ||
| + | < | ||
| + | sar -I XALL 1 | grep -v 0.00 | ||
| + | </ | ||
| + | |||
| + | ==== Iptables ==== | ||
| + | == icmp rate limiting == | ||
| + | <code bash> | ||
| + | iptables -A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 1/second --limit-burst 1 -j ACCEPT | ||
| + | iptables -A OUTPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 1/second --limit-burst 1 -j ACCEPT | ||
| </ | </ | ||
linux.1543223082.txt.gz · Last modified: 2019/09/16 16:09 (external edit)
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