“Debugging is on the table” Dr. House pergunta a um Sysadmin

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- Linux Troubleshooting palestra feita para o evento FLISOL2016/Brasil. - Linux Troubleshooting lecture made for the event FLISOL 2016 / Brazil

Technology

“Debugging is on the table”
Dr. House pergunta a um Sysadmin
Leonardo Martins Abril/2016

POR ONDE COMEÇAR?
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

Leonardo Martins
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

http://i3.cpcache.com/product/228415899/rtfm_mug.jpg
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

Hipótese
confirmada?
Problema
resolvido!!
SIM
NÃO
Coletar
informações
Definir
problema
Construir
hipótese
Testar
hipótese
Construir
nova hipótese
Guardar os
dados coletados
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

Hipótese
confirmada?
Problema
resolvido!!
Coletar
informações
Definir
problema
Construir
hipótese
Testar
hipótese
Construir
nova hipótese
Guardar os
dados coletados
SIM
NÃO
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

DEFINIÇÃO DE PROBLEMA
O que te faz pensar que existe um problema?
O que causou esse problema?
O que foi mudado recentemente?
Isso já funcionou alguma vez ?
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

COLETA DE INFORMAÇÕES
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

COLETA DE INFORMAÇÃO
# apt-get install htop
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

COLETA DE INFORMAÇÕES
# apt-get install sysstat
# apt-get install dstat
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

- tcpdump -i eth0 -T snmp "(src port 161 or 162)"
- tcpdump -i eth0 'udp port 53'
- tcpdump "tcp[tcpflags] & (tcp-syn|tcp-ack) != 0"
- tcpdump -i eth0 'tcp port 22' -w saida.pcap
- tshark -r saida.pcap
COLETA DE INFORMAÇÕES
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

COLETA DE INFORMAÇÕES
- strace ./get_http.py
- strace -e trace=open,close ./get_http.py
- strace -f -e trace=network ./test_tcp.sh
# apt-get install strace
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

COLETA DE INFORMAÇÕES
- lsof /var/log/nginx/access.log
- lsof -u $USER
- lsof -p PID
- lsof -i |grep LISTEN
- lsof -i :80
# apt-get install lsof
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

COLETA DE INFORMAÇÕES
- sysdig -c topprocs_cpu
- sysdig -c topscalls_time
- sysdig -c topfiles_time proc.name=nginx
# apt-get install sysdig
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

ANÁLISE DAS INFORMAÇÕES
http://www.zastavki.com/pictures/1600x1200/2008/Movies_Movies_H_House_M.D._010043_.jpg
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

TESTAR HIPÓTESES
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

TOP DOWN
http://computernetworkhomeworkhelp.com/wp-content/uploads/2014/01/comparision.png
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

BOTTOM UP
http://computernetworkhomeworkhelp.com/wp-content/uploads/2014/01/comparision.png
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

http://computernetworkhomeworkhelp.com/wp-content/uploads/2014/01/comparision.png
DIVIDIR E CONQUISTAR
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

CONSTRUIR NOVAS HIPÓTESES
?
?
?
?
?
?
?
?
http://watchesinmovies.info/img/f/House-Pathfinder.jpg
?
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

TOP DOWN
https://d0.awsstatic.com/architecture-diagrams/customers/parse-arch-diagram.png
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

BOTTOM UP
https://d0.awsstatic.com/architecture-diagrams/customers/parse-arch-diagram.png
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

FOLLOW THE REQUEST
https://d0.awsstatic.com/architecture-diagrams/customers/parse-arch-diagram.png
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

DRILL DOWN
https://d0.awsstatic.com/architecture-diagrams/customers/parse-arch-diagram.png
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

LOGS
https://www.graylog.org/overview
- Graylog
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

MONITORAÇÃO
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

MONITORAÇÃO
- CollectD + InfluxDB + Grafana
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

AUTOMAÇÃO
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

“Everybody lies” by Dr. House
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

http://www.brendangregg.com/Perf/linux_observability_tools.png
REFERÊNCIAS
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

REFERÊNCIAS
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

- http://www.zabbix.com
- https://www.graylog.org
- https://collectd.org
- https://influxdata.com
- http://grafana.org
- https://www.chef.io
- https://puppet.com
- https://www.ansible.com
- http://saltstack.com
https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com
REFERÊNCIAS

OBRIGADO!!
leonardoml@gmail.com
https://br.linkedin.com/in/leonardoml
http://images.fanpop.com/images/image_uploads/House-MD-house-md-630240_1360_768.jpg

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“Debugging is on the table” Dr. House pergunta a um Sysadmin

1. “Debugging is on the table” Dr. House pergunta a um Sysadmin Leonardo Martins Abril/2016

2. POR ONDE COMEÇAR? https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

3. https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

4. Leonardo Martins https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

5. Leonardo Martins https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

6. http://i3.cpcache.com/product/228415899/rtfm_mug.jpg https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

7. Hipótese confirmada? Problema resolvido!! SIM NÃO Coletar informações Definir problema Construir hipótese Testar hipótese Construir nova hipótese Guardar os dados coletados https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

8. Hipótese confirmada? Problema resolvido!! Coletar informações Definir problema Construir hipótese Testar hipótese Construir nova hipótese Guardar os dados coletados SIM NÃO https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

9. DEFINIÇÃO DE PROBLEMA O que te faz pensar que existe um problema? O que causou esse problema? O que foi mudado recentemente? Isso já funcionou alguma vez ? https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

10. COLETA DE INFORMAÇÕES https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

11. COLETA DE INFORMAÇÃO # apt-get install htop https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

12. COLETA DE INFORMAÇÕES https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

13. COLETA DE INFORMAÇÕES # apt-get install sysstat # apt-get install dstat https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

14. - tcpdump -i eth0 -T snmp "(src port 161 or 162)" - tcpdump -i eth0 'udp port 53' - tcpdump "tcp[tcpflags] & (tcp-syn|tcp-ack) != 0" - tcpdump -i eth0 'tcp port 22' -w saida.pcap - tshark -r saida.pcap COLETA DE INFORMAÇÕES https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

15. - tcpdump -i eth0 -T snmp "(src port 161 or 162)" - tcpdump -i eth0 'udp port 53' - tcpdump "tcp[tcpflags] & (tcp-syn|tcp-ack) != 0" - tcpdump -i eth0 'tcp port 22' -w saida.pcap - tshark -r saida.pcap COLETA DE INFORMAÇÕES # apt-get install tshark # apt-get install tcpdump https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

16. COLETA DE INFORMAÇÕES - strace ./get_http.py - strace -e trace=open,close ./get_http.py - strace -f -e trace=network ./test_tcp.sh # apt-get install strace https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

17. COLETA DE INFORMAÇÕES - lsof /var/log/nginx/access.log - lsof -u $USER - lsof -p PID - lsof -i |grep LISTEN - lsof -i :80 # apt-get install lsof https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

18. COLETA DE INFORMAÇÕES - sysdig -c topprocs_cpu - sysdig -c topscalls_time - sysdig -c topfiles_time proc.name=nginx # apt-get install sysdig https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

19. ANÁLISE DAS INFORMAÇÕES http://www.zastavki.com/pictures/1600x1200/2008/Movies_Movies_H_House_M.D._010043_.jpg https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

20. Hipótese confirmada? Problema resolvido!! SIM NÃO Coletar informações Definir problema Construir hipótese Testar hipótese Construir nova hipótese Guardar os dados coletados https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

21. TESTAR HIPÓTESES https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

22. TOP DOWN http://computernetworkhomeworkhelp.com/wp-content/uploads/2014/01/comparision.png https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

23. BOTTOM UP http://computernetworkhomeworkhelp.com/wp-content/uploads/2014/01/comparision.png https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

24. http://computernetworkhomeworkhelp.com/wp-content/uploads/2014/01/comparision.png DIVIDIR E CONQUISTAR https://br.linkedin.com/in/leonardoml Leonardo Martins - leonardoml@gmail.com

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