aula nagios no linux debianv4.pdf
TRANSCRIPT
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
CURSO TÉCNICO DE REDES DE COMPUTADORES
NOTAS DE AULAS
COMP. CURRICULAR: RDCP 2Monitoramento com Nagios no LINUX Debian 6Professores: Herbert Borges
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Nagios 3Monitoramento de servidores
Em Linux
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Plano de aula
Objetivos específicos: adquirir conhecimentos e desenvolver a
capacidade de compreensão do Sistema operacional Linux com
monitoramento NAGIOS3
Tópicos abordados: Monitoramento com Nagios3 de servidor windows2008 server R2
Monitoramento com Nagios3 de servidor Debian 6 Squeeze
Monitoramento com Nagios3 de switch 3com 4500
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Você Alcançar a consciência imediata de problemas deinfraestrutura de TI, assim o tempo de inatividade não
prejudicar o seu negócio.Nagios oferece monitoramento completo e alertando para osservidores, switches, aplicações e serviços.
Nagios é o padrão da indústria em TI
Monitoramento de Infra-estrutura
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Com Nagios você pode:
• Monitorar sua infra-estrutura de TI inteira• Detectar problemas antes que eles ocorram• Saber imediatamente quando surgem problemas
• Compartilhar dados de disponibilidade com as partesinteressadas• Detectar falhas de segurança• Planejar atualizações e orçamento para TI• Reduzir as perdas de “tempo de inatividade e de negócios”
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
A equipe de TI configurar o Nagios para monitorarcomponentes críticos de infraestrutura de TI, incluindo asmétricas do sistema, protocolos de rede, aplicativos,
serviços, servidores e infra-estrutura de rede.
Monitoramento
Como funciona:
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Nagios envia alertas quando os componentes de infraestruturacrítica falhar e se recuperar, fornecendo aos administradorescom aviso de eventos importantes. Os alertas podem serentregues via e-mail, SMS, ou script personalizado.
Alertando
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
A equipe de TI pode reconhecer alertas e começar a resolver
falhas e investigar os alertas de segurança imediatamente. Osalertas podem ser escalados para diferentes grupos se osalertas não são reconhecidas em tempo hábil.
Resposta
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Relatórios fornecem um registro histórico de quedas, eventos,notificações e resposta alerta para posterior análise. Relatóriosde disponibilidade ajudar a garantir se o seu SLAs estão
sendo atendidas.
Reportagem
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Tempo de inatividade programado impede alertas durante amanutenção e atualização do Windows.
Manutenção
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Tendências e gráficos de capacidade de planejamento erelatórios permitem identificar melhorias de infra-estruturanecessárias antes de ocorrerem falhas.
Planejamento
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Topologia Logica
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Virtual box no servidorNagios3
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Adaptador1 ETH0Configuração da placa de rede do servidor LDAP no virtual box
3
2
41
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Adaptador2 ETH1Configuração da placa de rede do servidor LDAP no virtual box
5
6
7
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Vamos alterar o nome do servidor
Vamos verificar qual a versão do sistema operacional que estamos utilizando
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Configuração da placa de rede do servidor Nagios no Linux
Bridge
HostOnly
Vamos deixar os nomes das placas de rede padrão ETH0 e ETH1
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Descomentaressas linhas
Vamos abrir o arquivo bash.bashrc já posicionando na linha 32
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Vamos instalar o pacote vim que é o editor de texto padrão que usaremos no curso
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Adicionar essas linhas
Com as linhas abaixo vamos deixar o editor de texto com
numeração, colorido etc
C 2 | 3
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Vamos instalar o pacote bind9 que vai ser o servidor DNS
RDCP2 | N i 3 M it t Li D bi
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Vamos instalar as ferramentas de pesquisa do DNS nslookup, dig, host
RDCP2 | N i 3 M it t Li D bi
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
O arquivo /etc/resolv.conf é onde configuramos quem vai ser o servidor DNS… adicionemais um servidor DNS que é a propria maquina… para isso você só precisa adicionar nofinal do seu arquivo só a linha 4 do exemplo abaixo nameserver 192.17.100.20
Ou seja seu arquivo precisa ter essa linha no final
RDCP2 | N i 3 M it t Li D bi
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Vamos deixar o arquivo /etc/resolv.conf imultavel
RDCP2 | N i 3 M it t Li D bi
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Neste arquivo devemos apagar das linhas 1 a 8 e a partir da linha19. As unicas que ficarao no arquivo é da linha 10 a 18.
Manter essas linhas
que estao na chave.
RDCP2 | Nagios 3 Monitoramento Lin Debian
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Deixar o arquivo conforme figura abaixo
No proximo slide use %s/localhost/srvlNagios.senailab.int/g para fazer asalterações
RDCP2 | Nagios 3 Monitoramento Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Vamos fazer teste com o comando nslookup
RDCP2 | Nagios 3 Monitoramento Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Só para conferir
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
123
Digite a senha 123
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
123
Digite a senha 123
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
Digite o nome do dominio “senailab.int”
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
Durante a instalação do apache2, automaticamente é criado o usuariowww-data, esse usuário, por padrão é quem executa o apache.Para identificar com qual usuário o apache esta sendo executado:# cat /etc/apache2/envars
Para que o usuario nagios possa executar comandos através dainterface web do apache devemos adiciona-lo ao grupo do apache,para isso execute:# usermode -G nagios nagios
# user -G www-data, nagios www-data
Para conferir se o usuário foi mesmo adicionado ao grupo:# grep nagios /etc/group
Veja proximo slide que esta executando essas tarefas:
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
123123
modifica para o usuario nagios o grupo complementar nagiosmodifica para o usuario www-data o grupo complementar nagiose www-data
Syntax usermod –G grupos usuario
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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RDCP2 | Nagios 3 Monitoramento Linux Debian
Vamos reiniciar os serviço do nagios para aplicar as alterações
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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C | ag os 3 o to a e to u eb a
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| g
No windows 7
Host only
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| g
123
Repare que estamos fazendo o acesso pelo proprio nome do dominio eentrada monitoramento, isso quer dizer que o servidor DNS esta funcionando
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| g
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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| g
Repare que clicando no menu “Services” já esta monitorando odisco em “Disk Space” e o servidor web apache em “HTTP” e
també o serviço de acesso remoto em “SSH”, que incluvive estaem critical porque não esta instalado o SSH no servidorNagios… se instalarmos vai aparecer ok.
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| g
Vamos instalar o SSH
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Clique em service
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e aguarde ums 2minutos para
normalizar o SSH
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Vamos parar o serviço o SSH simulando a ação de algumproblema
Aguarde pois demoar
Pressione F5 paraatualizar o navegador
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Para obter mais detalhes do que esta acontendo
Clique aqui
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Vamos fazer o monitoramento doserviço de FTP
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Faça copia do texto da linha 52 a 59 na linha 61 a 68
Alterações feitas
8 linhasLinha 52 y8yLinha 60 p
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Repare que já esta aparecendo “Serviço FTP VSFTPD” e que
esta pendente aguarde…
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Vamos iniciar o serviço o SSH simulando a correção de algumproblema… aguarde.
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Vamos fazer a alteração arquivo abaixo para o nagios aceitar comando externos
Vamos fazer a alteração de permisionamento
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Vamos reiniciar para aplicar as novas alterações
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Repare a nuvem indica que podemos adicionar comentario
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Vamos adicionar um comentario para o alerta que o seviço parou
Repare que recebemos um resposta que nosso comentario foi adicionado com sucesso
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Aqui podemos visualizar nosso comentario que ficou registrado… esse comentariopode ser uma ação que foi tomada para resolver o problema e todos que estiveremmonitorando o servidor
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Descobrir qual comando eu uso para monitorar determinado serviço dentro doarquivo: na linha
Exemplo: quero monitorar serviço de email
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Comando que podemos usar
Então abrimos o arquivo mail.cfg e descobrirmos que o comando para monitorarPop é: check_pop
Smtp é: check_smtp
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Vamos incluir o monitoramento de email para protocolo POPporem não vamos ter serviço de POP instalado
Faça copia do queesta na linha 61 até68 e cole no final doarquivo linha 70 edeixe conforme essafigura
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Aparece critical pois não temos serviço de email instalado
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Deixando o alerta do nagios mais rápido
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Para aplicar as alterações vamos reiniciar os serviços donagios3 e apache2
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Ao parar o serviço de “SSH” …Repare que clicando em host e service a atualizaçãodemora em torno de 10 a 15 segundos
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Vamos configurar para que o nagios enviarnotificação por email
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Deixa essa linhacomentada
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Vamos instalar utilitarios ou ferramentas de email
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123123
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123123
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Vamos abrir o “tty3” com <alt> esquerda + <F3>
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Vamos abrir o “tty2” com <alt> esquerda + <F2>
123
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No tty3 com usuario jorge mande um email para usuario joarez
No tty2 com usuario joarez tente receber email
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Vamos instalar o dovecot no terminal tty1
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Informar qual usuario vai receber email de alertas
Repare que joarez nao possui emails na caixa postal
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Aguarde com paciencia… no proximo slide mostra que o usuario Joarez estarecendo o alerta
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“q” para sair
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Continuação do slide anterior
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No tty1 iniciar o serviço de ftp
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Atualizando a entrar de registros do servidor DNS
Adicione também a entrada do tipo Awin2008 apontando para192.17.100.10
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Adicionando mais uma maquina para ser monitorada
Só temos um
host sendomonitorado
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Criando uma nova maquina
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Agora no servidor Nagios3
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Arquivo descomentado para bater a numeracao
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Configurando o nagios para monitorar umservidor windows
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V i i d l já i
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Vamos copiar um arquivo de exemplo que já vem no nagiospara monitorar maquinas windows para a pasta que estou no
momento, por isso estou usando ponto no final do comando
Vamos editar o arquivo copiado windows.cfg e colocar o IP doservidor windows 2008 server que iremos monitorar
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V dit i t l t f d i b i
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* Esc :89 para ir para linha 89… pressione a tecla esc 15yypara copiar 15 linhas… sair sem gravar
Vamos editar o arquivo templetes.cfg.gz da imagem a baixo ecopiar 15 linhas que vai da linha 89 áté a 103
Atenção: Proximo slide iremos executar o texto acima
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* Abrir o arquivo windows da figura do proximo slide e colar
o que foi copiado na linha 24 <esc> : p conforme figura noproximo slide
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Repare que esta com missing –l parameter… vamos corrigirisso no proximo slide
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Conforme figura abaixo tire as aspas simples de$HOSTADDRESS$ e $ARG1$ e então adicione$ARG2$ e a porta –p 12489
Tirar aspasTirar aspas Acrescente $ARG2$
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P i lid l i i b l d
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Proximo slide vamos colocar o icone simbolo damicrosoft ao lado do servidor windows 2008 serverque esta sendo monitorado, da mesma forma que jáaparece por padrão o icone do Debian junto aoservidor debian que esta sendo monitorado
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Adicionar esse blocono final do arquivocopiar das linhas 5 a13
Adicionar esse blocono final do arquivo…
copiar das linhas 24 a29
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O agente NSClient é o responsável por abrir a porta 12489
do servidor/desktop instalado para que o servidor Nagiospossa capturar as informações configuradas.
Endereço para fazer o Download do NSClient
Extraia o arquivo nsclient.msi dentro do C: e execute a
instalação
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Desça pela barra derolagem
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Clique botãodireito
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Descomentar a linha SysTray
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Nessa sessão
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Somente Verificar Descomentar essa linha
Nessa sessão
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Descomentar essa linha
Descomentar essa linha
Nessa sessão
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Al t d IIS
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IIS – Precisa ser instalado para sumir esse alerta
Alerta do IIS
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Aguarde com paciencia e clique em services
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g p q
Repare abandeirinha
Repare queestafuncinando
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Vamos monitorarSwitch da 3com 4500
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Vamos aprender como alterar o endereço do switch para fazero monitoramento
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Deixar em branco
o monitoramentoNo meu caso esse é o endereço IP do switch
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Tela inicial ou menu principal do switch 3com 4500
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Vamos clicar no menu administração e depois no sub menu IPsetup
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setup
12
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3
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1
4
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É nesta tela queconseguimos alterar o
endereço IP e mascara
6
5
7
8
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9
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Vamos copiar o arquivo inteiro de templete de switch.cfg que já vem 90% pronto para a pasta do nagios3
Agora que já sabemos qual é o IP do switch da 3com que
queremos monitorar … vamos configurar o nagios para fazer omonitoramento de desse switch
RDCP2 | Nagios 3 Monitoramento - Linux Debian
Vamos copiar parte de outro arquivo “templete.cfg.gz e colarno arquivo switch.cfg que acabamos de copiar
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Copiar 15 linhas apartirda linha 124 até a 138… Vai até a linha 124pressione <esc> y15ypara copiar as 15 linhas<esc> :q!
Essas linhas copiadasvamos colar no arquivo/etc/nagios3/conf.d/switch
q g q p
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Vai na linha 11 epressione p para colar
RDCP2 | Nagios 3 Monitoramento - Linux Debian
Copiar essas duas linhas e colar
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colar essaslinhas na linha25
Copiar essaslinhas
IP que colocamos no switch
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Nesse mesmo arquivo apague da linha noventa parabaixo ou seja tudo que você esta vendo no proximoslide deve ser apagado
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Apagar todas as linhas desse slide e as demais linhas abaixo
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Resumindo o arquivo /etc/nagios3/conf.d/switch.cfgdeve ficar conforme os proximos 2 slides
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Pronto estamos monitorando o switch da 3com 2400
?
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123d
RDCP2 | Nagios 3 Monitoramento - Linux Debian
Ultima tela finalizando instalação do pacote
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Descomente essa linha
Incluir essa linha
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Clique com botão direito
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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* Clique aqui com
botão direito e vejaproximo slide
RDCP2 | Nagios 3 Monitoramento - Linux Debian
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Agora clique em cima do servidor windows com a cruz
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Agora vamos fazer para o proprio servidor nagios3
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Vamos adicionar servidor SSH
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Clique em cima do computador servidor SSH
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Basta que um servidor tenho alerta que a topologia fica com x
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RDCP2 | Nagios 3 Monitoramento - Linux Debian
Integra nagvis com o menu do nagios3
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Faça copia da linha 40 e cola no mesmo lugar a linha que era 40 passa a ser 41 ealtere a linha 40 conforme figura abaixo
RDCP2 | Nagios 3 Monitoramento - Linux Debian
Repare que apareceu Nagvis no menu do NAGIOS
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