2023/03/28

Анализ производительности

uptime
dmesg -T | tail
vmstat -SM 1
mpstat -P ALL 1
pidstat 1
iostat -sxz 1
free -m
sar -n DEV 1
sar -n TCP,ETCP
top

2022/12/16

SNMP error: (noSuchName) There is no such variable name in this MIB.

Иногда, в Zabbix можно увидеть ошибку "SNMP error: (noSuchName) There is no such variable name in this MIB.", обычно на discovery правилах. Проблема связана с тем, что по-умолчанию Zabbix использует bulk-зарпосы, которые не всегда работают для некоторых устройств. Чтобы избежать этой ошибки, достаточно в настройках интерфейса SNMP в Zabbix у хоста снять галочку с ``Use bulk requests'.

2021/09/15

Verifying that a Private Key Matches a Certificate

Сверка модуля ключа сертификата с модулем приватного ключа:
# openssl x509 -noout -modulus -in fullchain.pem | openssl md5
# openssl rsa -noout -modulus -in privkey.pem | openssl md5
Они должны совпадать.

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