Ansible: Como monitorar automaticamente instâncias do Amazon EC2 recém-criadas usando o Prometheus?
Publicados: 2021-12-19
Você tem alguma das perguntas abaixo?
- Use a descoberta de serviço baseada em arquivo para descobrir destinos de raspagem
- Como descobrir automaticamente o uso de vários IPs?
- Monitorando automaticamente instâncias do EC2
- Monitoramento com Prometheus
- Usando o Prometheus para monitorar instâncias recém-criadas do Amazon EC2?
- Como atualizar dinamicamente o arquivo de lista de IP de destinos do Prometheus após criar VMs do Amazon EC2?
O Ansible é, sem dúvida, a melhor ferramenta de automação de operações do mercado. No Crunchify, publicamos mais de uma dúzia de artigos do Ansible sobre vários tópicos.
Neste tutorial, veremos como atualizar o arquivo de lista de IPs do Prometheus Targets após criar VMs do Amazon EC2 dinamicamente.
Considere este cenário:
- Você está executando o Prometheus para monitorar sua infraestrutura de produção.
- Siga o tutorial de configuração do Prometheus em detalhes.
- Usando ansible spawn 5 novas VMs Amazon EC2
- Siga o tutorial de geração de nova instância do Amazon EC2 completamente.
- Obtenha 5 IPs e atualize o grupo [crunchify] em tempo de execução
- Siga completamente o tutorial do grupo de atualização de arquivos hosts ansible.
- Atualize o arquivo
crunchify_prometheus.txt
com o IP atualizado - Envie o arquivo para o novo host onde você tem o prometheus em execução
- O Prometheus lerá este novo
updated IP file
dinamicamente - Você terá todos os novos
hosts
monitorados automaticamente
Para as etapas de 4 a 7, revisaremos todas as etapas aqui.

Etapas detalhadas:
- Obtenha a lista de todos os IPs do arquivo de hosts ansible no grupo
[Crunchify]
. - Adicione todos os IPs ao arquivo
crunchify.txt
apenas para fins de teste. Não vamos usar este arquivo nas próximas etapas. - Exclua o arquivo crunchify_prometheus.json existente.
- Crie um novo arquivo
crunchify_prometheus.json
com o novo arquivo de lista de IP do prometheus de amostra. - Substitua
iplist
do arquivocrunchify_prometheus.json
pela lista de IPs. - Substitua
u'
por'
. - Substitua
'
por"
. - Exclua o arquivo crunchify_prometheus.json existente do host remoto em que o processo do Prometheus está em execução.
- Copie o arquivo crunchify_prometheus.json do host local para o host remoto para que o prometheus possa consumi-lo.
arquivo crunchify_prometheus_file_update.yml.
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--- - name : Update Prometheus Targets IP List file after creating Amazon EC2 VMs Dynamically hosts : local connection : local gather_facts : True tasks : - name : Get list of all IPs from group Crunchify set_fact : nodelist = "{{ groups['Crunchify'] }}" - name : Add all IPs to file crunchify . txt just for testing purpose . We are not going to use this file in next steps . lineinfile : path : "crunchify.txt" line : "{{ nodelist }}" - name : Delete existing crunchify_prometheus . json file ignore_errors : yes shell : rm crunchify_prometheus . json - name : Create new crunchify_prometheus . json file with sample new prometheus IP list file . copy : dest : "crunchify_prometheus.json" content : [ { "targets" : iplist , "labels" : { "job" : "crunchify_prometheus_job" } } ] - name : Replace iplist from file crunchify_prometheus . json with list of IPs replace : path : "crunchify_prometheus.json" regexp : '"iplist"' replace : "{{ nodelist }}" - name : Replace u ' with ' replace : path : "crunchify_prometheus.json" regexp : 'u' ' replace: ' '' - name : Replace ' with " replace: path: "crunchify_prometheus.json" regexp: "' " replace: " \ "" - hosts : linode become : yes tasks : - name : Delete existing crunchify_prometheus . json file from remote host where Prometheus process is running . ignore_errors : yes command : rm / root / crunchify / crunchify_prometheus . json - name : Copy file crunchify_prometheus . json from local host to remote host so prometheus can consume it . copy : src = { { item . src } } dest = { { item . dest } } with_items : - { src : '//cdn.crunchify.com/Users/crunchify/Documents/ansible/crunchify_prometheus.json' , dest : '/root/crunchify/' } |
Execute o Ansible Playbook:
1 |
ansible - playbook - v - i . / hosts crunchify_prometheus_file_update . yml |
Resultado do Ansible Playbook:
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bash Crunchify $ ansible - playbook - v - i . / hosts crunchify_prometheus_file_update . yml WARNING : Executing a script that is loading libcrypto in an unsafe way . This will fail in a future version of macOS . Set the LIBRESSL_REDIRECT_STUB_ABORT = 1 in the environment to force this into an error . No config file found ; using defaults / Users / crunchify / Documents / ansible / hosts did not meet host_list requirements , check plugin documentation if this is unexpected / Users / crunchify / Documents / ansible / hosts did not meet script requirements , check plugin documentation if this is unexpected PLAY [ Update Prometheus Targets IP List file after creating Amazon EC2 VMs Dynamically ] ************************************************************************ TASK [ Gathering Facts ] ***************************************************************************************************************************************** ok : [ localhost ] TASK [ Get list of all IPs from group Crunchify ] ******************************************************************************************************************* ok : [ localhost ] = > { "ansible_facts" : { "nodelist" : [ "5.17.14.87" , "8.17.24.26" , "96.17.67.11" , "62.17.64.87" ] } , "changed" : false } TASK [ Add all IPs to file crunchify . txt just for testing purpose . We are not going to use this file in next steps . ] ******************************************** ok : [ localhost ] = > { "backup" : "" , "changed" : false , "msg" : "" } TASK [ Delete existing crunchify_prometheus . json file ] ********************************************************************************************************** [ WARNING ] : Consider using the file module with state = absent rather than running 'rm' . If you need to use command because file is insufficient you can add 'warn: false' to this command task or set 'command_warnings=False' in ansible . cfg to get rid of this message . changed : [ localhost ] = > { "changed" : true , "cmd" : "rm crunchify_prometheus.json" , "delta" : "0:00:00.004614" , "end" : "2019-08-31 19:05:28.214368" , "rc" : 0 , "start" : "2019-08-31 19:05:28.209754" , "stderr" : "" , "stderr_lines" : [ ] , "stdout" : "" , "stdout_lines" : [ ] } TASK [ Create new crunchify_prometheus . json file with sample new prometheus IP list file . ] ********************************************************************** changed : [ localhost ] = > { "changed" : true , "checksum" : "0f561a2aedb23d9b6e76a93af377cf0128c9f4c6" , "dest" : "./crunchify_prometheus.json" , "gid" : 20 , "group" : "staff" , "md5sum" : "6a8d4a45c6b38bd6e664ce1cdc7f001a" , "mode" : "0644" , "owner" : "Crunchify" , "size" : 70 , "src" : "/Users/crunchify/.ansible/tmp/ansible-tmp-1567296328.29-229442409470865/source" , "state" : "file" , "uid" : 502 } TASK [ Replace iplist from file crunchify_prometheus . json with list of IPs ] ************************************************************************************* changed : [ localhost ] = > { "changed" : true , "msg" : "1 replacements made" } TASK [ Replace u ' with ' ] *************************************************************************************************************************************** ok : [ localhost ] = > { "changed" : false , "msg" : "" } TASK [ Replace ' with "] **************************************************************************************************************************************** changed: [localhost] => {"changed": true, "msg": "8 replacements made"} PLAY [linode] ************************************************************************************************************************************************** TASK [Gathering Facts] ***************************************************************************************************************************************** ok: [11.33.64.98] TASK [Delete existing crunchify_prometheus.json file from remote host where Prometheus process is running.] **************************************************** changed: [11.33.64.98] => {"changed": true, "cmd": ["rm", "//cdn.crunchify.com/root/crunchify/crunchify_prometheus.json"], "delta": "0:00:00.002704", "end": "2019-09-01 00:05:32.687400", "rc": 0, "start": "2019-09-01 00:05:32.684696", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []} TASK [Copy file crunchify_prometheus.json from local host to remote host so prometheus can consume it.] ******************************************************** changed: [11.33.64.98] => (item={u' dest ': u' / root / crunchify / ', u' src ': u' / Users / crunchify / Documents / ansible / crunchify_prometheus . json ' } ) = > { "changed" : true , "checksum" : "ecea3eafaf9ba3e66698e0851d2ee2513d9fcd5f" , "dest" : "//cdn.crunchify.com/root/crunchify/crunchify_prometheus.json" , "gid" : 0 , "group" : "root" , "item" : { "dest" : "/root/crunchify/" , "src" : "//cdn.crunchify.com/Users/crunchify/Documents/ansible/crunchify_prometheus.json" } , "md5sum" : "8b8f073e30b180c63341cd3fd4c47974" , "mode" : "0644" , "owner" : "root" , "size" : 122 , "src" : "/root/.ansible/tmp/ansible-tmp-1567296332.67-196855844989682/source" , "state" : "file" , "uid" : 0 } PLAY RECAP * **************************************************************************************************************************************************** 11.33.64.98 : ok = 3 changed = 2 unreachable = 0 failed = 0 localhost : ok = 8 changed = 4 unreachable = 0 failed = 0 |
É isso. Parabéns. Você copiou com sucesso o novo arquivo atualizado para o novo host e o Prometheus agora está monitorando automaticamente suas instâncias do Amazon EC2 recém-criadas.

Qual é o próximo?
Confira o tutorial sobre como install docker
no Linux.