{"id":3007,"date":"2014-09-10T03:28:53","date_gmt":"2014-09-10T03:28:53","guid":{"rendered":"http:\/\/www.deuzebranaweb.com.br\/?p=3007"},"modified":"2014-09-10T03:28:53","modified_gmt":"2014-09-10T03:28:53","slug":"loadbalance-failover","status":"publish","type":"post","link":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/2014\/09\/10\/loadbalance-failover\/","title":{"rendered":"Loadbalance FAILOVER"},"content":{"rendered":"
Loadbalance FAILOVER:
\nEm um servidor com dois links de Internet, este script atuar\u00e1 no gerenciamento dos links. Caso o link que estiver ativo no momento, apresente erro (ou perda de conex\u00e3o com a Internet por algum motivo), o script mudar\u00e1 o tr\u00e1fego automaticamente para outro link existente. E se os dois links apresentarem problemas, ent\u00e3o o script tenta uma repara\u00e7\u00e3o, restartando a rede e setando novamente as configura\u00e7\u00f5es: vari\u00e1veis, limpeza de tabelas (iptables), roteamento, NAT e gateways.Obs.: \u00c9 extremamente importante que cada gateway esteja configurado de acordo com sua interface nas VARI\u00c1VEIS (“iface1” de acordo com “gw1” e “iface2” de acordo com “gw2″) do script, para que o route trate corretamente as sa\u00eddas.Exemplo:
\niface1=eth0 (interface)
\ngw1=”10.26.20.1″ (gateway)<\/p>\n

iface2=eth1 (interface)
\ngw2=”10.15.20.1” (gateway)<\/p>\n<\/div>\n

[ Download: loadbalanceFAILOVER.sh<\/a> ]\u00a0\u00a0 [ Enviar nova vers\u00e3o<\/a> ]<\/p>\n

[ Esconder c\u00f3digo-fonte<\/a> ]<\/p>\n

\n
\n\n\n\n
\n
\n
#!\/bin\/bash<\/code><\/div>\n
\u00a0<\/code><\/div>\n
\u00a0\u00a0<\/code>### CONFIGURE AS VARI\u00c1VEIS AQUI:<\/code><\/div>\n
\u00a0\u00a0<\/code>testeip=<\/code>\"8.8.8.8\"<\/code><\/div>\n
\u00a0\u00a0<\/code>iface1=eth0<\/code><\/div>\n
\u00a0\u00a0<\/code>iface2=eth1<\/code><\/div>\n
\u00a0\u00a0<\/code>gw1=<\/code>\"10.26.20.1\"<\/code><\/div>\n
\u00a0\u00a0<\/code>gw2=<\/code>\"10.15.20.1\"<\/code><\/div>\n
\u00a0\u00a0<\/code>nomeGw1=<\/code>\"CTBC\"<\/code><\/div>\n
\u00a0\u00a0<\/code>nomeGw2=<\/code>\"EMBRATEL\"<\/code><\/div>\n
\u00a0\u00a0<\/code>### FIM DA CONFIG.<\/code><\/div>\n
\u00a0\u00a0<\/code>rota1=0<\/code><\/div>\n
\u00a0\u00a0<\/code>rota2=0<\/code><\/div>\n
\u00a0\u00a0<\/code>nomeScript=<\/code>\"loadbalanceFAILOVER.sh\"<\/code><\/div>\n
<\/div>\n
iniciar(){<\/code><\/div>\n
\u00a0\u00a0<\/code>### LIMPEZA:<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -t mangle -F<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -t mangle -X<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables --flush<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -F<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -t nat -F<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -X<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -t nat -X<\/code><\/div>\n
\u00a0\u00a0<\/code>ip route flush cache<\/code><\/div>\n
\u00a0\u00a0<\/code>### HABILITA ROTEAMENTO:<\/code><\/div>\n
\u00a0\u00a0<\/code>echo<\/code> \"1\"<\/code> > <\/code>\/proc\/sys\/net\/ipv4\/ip_forward<\/code><\/div>\n
\u00a0\u00a0<\/code>### MASCARA OS PACOTES COM DESTINO A INTERNET (NAT):<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -t nat -A POSTROUTING -o $iface1 -j MASQUERADE<\/code><\/div>\n
\u00a0\u00a0<\/code>iptables -t nat -A POSTROUTING -o $iface2 -j MASQUERADE<\/code><\/div>\n
\u00a0\u00a0<\/code>### ADICIONA OS GATEWAYS NAS DEVIDAS INTERFACES:<\/code><\/div>\n
\u00a0\u00a0<\/code>route add -net default gw $gw1 dev $iface1<\/code><\/div>\n
\u00a0\u00a0<\/code>route add -net default gw $gw2 dev $iface2<\/code><\/div>\n
<\/div>\n
### LINK 1 ATIVO<\/code><\/div>\n
clear<\/code><\/div>\n
echo<\/code> \"Link em atividade: $nomeGw1\"<\/code><\/div>\n
echo<\/code> \"Interface:$iface1\"<\/code><\/div>\n
echo<\/code> \"Gateway:$gw1\"<\/code><\/div>\n
echo<\/code> \"Status: Ok\"<\/code><\/div>\n
while<\/code> [ $(<\/code>ping<\/code> -qc 3 $testeip -I $iface1 > <\/code>\/dev\/null<\/code> 2>&1 ; <\/code>echo<\/code> $? ) = 0 ]<\/code><\/div>\n
\u00a0\u00a0<\/code>do<\/code><\/div>\n
\u00a0\u00a0<\/code>if<\/code> [ $rota1 = 0 ]<\/code><\/div>\n
\u00a0\u00a0<\/code>then<\/code><\/div>\n
\u00a0\u00a0<\/code>rota1=1<\/code><\/div>\n
\u00a0\u00a0<\/code>route del -net default gw $gw2 dev $iface2<\/code><\/div>\n
\u00a0\u00a0<\/code>fi<\/code><\/div>\n
done<\/code><\/div>\n
<\/div>\n
route add -net default gw $gw2 dev $iface2<\/code><\/div>\n
<\/div>\n
### LINK 2 ATIVO<\/code><\/div>\n
clear<\/code><\/div>\n
echo<\/code> \"Link em atividade: $nomeGw2\"<\/code><\/div>\n
echo<\/code> \"Interface:$iface2\"<\/code><\/div>\n
echo<\/code> \"Gateway:$gw2\"<\/code><\/div>\n
echo<\/code> \"Status: Ok\"<\/code><\/div>\n
while<\/code> [ $(<\/code>ping<\/code> -qc 3 $testeip -I $iface2 > <\/code>\/dev\/null<\/code> 2>&1 ; <\/code>echo<\/code> $? ) = 0 ]<\/code><\/div>\n
\u00a0\u00a0<\/code>do<\/code><\/div>\n
\u00a0\u00a0<\/code>if<\/code> [ $rota2 = 0 ]<\/code><\/div>\n
\u00a0\u00a0<\/code>then<\/code><\/div>\n
\u00a0\u00a0<\/code>rota2=1<\/code><\/div>\n
\u00a0\u00a0<\/code>route del -net default gw $gw1 dev $iface1<\/code><\/div>\n
\u00a0\u00a0<\/code>fi<\/code><\/div>\n
\u00a0\u00a0<\/code>done<\/code><\/div>\n
<\/div>\n
### Se os links estiverem 'down', tenta uma repara\u00e7\u00e3o restartando a rede e chamando novamente o script:<\/code><\/div>\n
if<\/code> [ $(<\/code>ping<\/code> -qc 3 $testeip -I $iface1 > <\/code>\/dev\/null<\/code> 2>&1 ; <\/code>echo<\/code> $? ) != 0 ] || [ $(<\/code>ping<\/code> -qc 3 $testeip -I $iface2 > <\/code>\/dev\/null<\/code> 2>&1 ; <\/code>echo<\/code> $? ) != 0 ]<\/code><\/div>\n
\u00a0\u00a0<\/code>then<\/code><\/div>\n
\u00a0\u00a0<\/code>clear<\/code><\/div>\n
\u00a0\u00a0<\/code>echo<\/code> \"Sem conexao!\"<\/code><\/div>\n
\u00a0\u00a0<\/code>echo<\/code> \"Tentando reparar...\"<\/code><\/div>\n
\u00a0\u00a0<\/code>\/etc\/init<\/code>.d<\/code>\/networking<\/code> stop<\/code><\/div>\n
\u00a0\u00a0<\/code>\/etc\/init<\/code>.d<\/code>\/networking<\/code> start<\/code><\/div>\n
\u00a0\u00a0<\/code>iniciar<\/code><\/div>\n
fi<\/code><\/div>\n
}<\/code><\/div>\n
parar(){<\/code><\/div>\n
kill<\/code> -9 `<\/code>ps<\/code> aux | <\/code>grep<\/code> $nomeScript | <\/code>awk<\/code> '{print $2}'<\/code>`<\/code><\/div>\n
echo<\/code> \"Morto\"<\/code><\/div>\n
exit<\/code><\/div>\n
}<\/code><\/div>\n
helpp(){<\/code><\/div>\n
echo<\/code> \"Para executar o script, usa-se a seguinte sintaxe:\"<\/code><\/div>\n
echo<\/code> \" \"<\/code><\/div>\n
echo<\/code> \"Iniciar:\"<\/code><\/div>\n
echo<\/code> \"sh $nomeScript start\"<\/code><\/div>\n
echo<\/code> \"Parar:\"<\/code><\/div>\n
echo<\/code> \"sh $nomeScript stop\"<\/code><\/div>\n
echo<\/code> \"Rodar em modo background:\"<\/code><\/div>\n
echo<\/code> \"sh $nomeScript start &\"<\/code><\/div>\n
echo<\/code> \"Ap\u00f3s rodar em background, verifique se est\u00e1 rodando:\"<\/code><\/div>\n
echo<\/code> \"ps aux | grep $nomeScript\"<\/code><\/div>\n
echo<\/code> \"Obs.: N\u00e3o esquecer de configurar as VARI\u00c1VEIS\u00a0\u00a0do script de acordo com sua rede.\"<\/code><\/div>\n
echo<\/code> \" \"<\/code><\/div>\n
echo<\/code> \"Desenvolvido por: Marcelo Viana\"<\/code><\/div>\n
echo<\/code> \" \"<\/code><\/div>\n
exit<\/code><\/div>\n
}<\/code><\/div>\n
case<\/code> $1 <\/code>in<\/code><\/div>\n
'start'<\/code>) iniciar ; <\/code>exit<\/code> ;;<\/code><\/div>\n
'stop'<\/code>) parar ; <\/code>exit<\/code> ;;<\/code><\/div>\n
'--help'<\/code>) helpp ; <\/code>exit<\/code> ;;<\/code><\/div>\n
*) <\/code>echo<\/code> \"Par\u00e2metro desconhecido: '$1'\"<\/code> ; <\/code>echo<\/code> \"Utilize --help para informa\u00e7\u00f5es. Exemplo: sh $nomeScript --help\"<\/code>; <\/code>exit<\/code> ;;<\/code><\/div>\n
esac<\/code><\/div>\n
# \u00c9 o Senhor que mostra os caminhos. Agrade\u00e7o por me ajudar atrav\u00e9s de tantos exemplos.<\/code><\/div>\n
# E que bom existe o vivaolinux!<\/code><\/div>\n
# www.technocristo.com<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

http:\/\/www.vivaolinux.com.br\/script\/LoadbalanceFAILOVER<\/p>\n","protected":false},"excerpt":{"rendered":"

Loadbalance FAILOVER: Em um servidor com dois links de Internet, este script atuar\u00e1 no gerenciamento dos links. Caso o link que estiver ativo no momento, apresente erro (ou perda de conex\u00e3o com a Internet por algum motivo), o script mudar\u00e1 o tr\u00e1fego automaticamente para outro…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_angie_page":false,"page_builder":"","footnotes":""},"categories":[20,16],"tags":[],"class_list":["post-3007","post","type-post","status-publish","format-standard","hentry","category-linux","category-shell"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/posts\/3007","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/comments?post=3007"}],"version-history":[{"count":0,"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/posts\/3007\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/media?parent=3007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/categories?post=3007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.deuzebranaweb.com.br\/index.php\/wp-json\/wp\/v2\/tags?post=3007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}