We have to be honest, logs are often an after thought to most developers. Many logs are pretty cryptic unless you can look at the code and see what is going on. In this section, we will share what we think of a specific log: - the cryptic ones, the fun ones and some of the ones we see more often.
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36 Tesla/feature-2022.20.9-31-abc ...Jul 18 16:05:27 myserver kernel: [736737.006413] nf_conntrack: nf_conntrack: table full, dropping packet
Jul 18 16:05:27 myserver kernel: [736737.006413] ip_conntrack: ip_conntrack: table full, dropping packet ...::1 - - [18/Jul/2022:19:23:52 +0000] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.52 (Ubuntu) OpenSSL/3.0.2 (internal dummy connection)" ...{"port":5601,"format":"netflowv5","header":{"version":5,"count":30,"sys_uptime":1914116404,"unix_secs":1654392803,"unix_nsecs":436470348,"flow_sequence":2577672181,"engine_type":0,"engine_id":0,"sampling_interval":0},"record":{"srcaddr":"19 ...May 21 12:18:26 proxy1 haproxy[2069]: 2.31.1.1:57475 [21/May/2022:12:18:26.382] httpsproxy/1: SSL handshake failure ...Mar 11 16:11:30 vpnproxy charon: 11[ENC] header verification failed ...May 18 13:24:18 garage 1281c277a279,UAP-HD-6.0.14+13634: mcad: mcad[19323]: wireless_agg_stats.log_sta_anomalies(): bssid=6b:83:c1:22:f1:21 radio=wifi1 vap=ath3 sta=ac:b1:2c:c3:52:01 satisfaction_now=0 anomalies=dns_timeout ...May 18 17:17:10 UAP-livingroom 65ff42c112d,UAP-HD-IW-5.60.23+13051: stahtd: stahtd[17220]: [STA-TRACKER].stahtd_dump_event(): {"message_type":"STA_ASSOC_TRACKER","mac":"11:41:17:a4:26:af","vap":"rai0","event_type":"fixup","auth_ts":"0.0","a ...May 12 21:28:26 log1 sshd[31245]: Invalid user gitlab from 216.158.228.199 port 59318 ...May 20 20:57:09 mx1 auth: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot ruser=daemon rhost=122.175.40.117 user=daemon ...May 20 23:56:19 mx1 postfix/smtps/smtpd[3425910]: warning: unknown[118.189.183.180]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 ...May 21 17:58:38 Dev-Mac-Pro powerd[80]: Display is turned on ...May 21 17:58:38 Dev-Mac-Pro powerd[80]: Display is turned off ...