centos - 连接回退失败(async(tcp ://ip:5044)): dial tcp ip:5044: i/o timeout

Question

Filebeat 在机器 B 上运行，它读取日志并推送到机器 A 上的 ELK logstash。

但是在机器 B 的 filebeat 日志中，它显示错误 i/o timeout

2019-08-24T12:13:10.065+0800    ERROR   pipeline/output.go:100  Failed to connect to backoff(async(tcp://example.com:5044)): dial tcp xx.xx.xx.xx:5044: i/o timeout 
2019-08-24T12:13:10.065+0800    INFO    pipeline/output.go:93   Attempting to reconnect to backoff(async(tcp://example.com:5044)) with 1 reconnect attempt(s)

我检查了机器 A 上运行良好的 logstash，可以监听 0 0.0.0.0:5044
这是logstash日志

[INFO ] 2019-08-24 12:09:35.217 [[main]-pipeline-manager] beats - Beats inputs: Starting input listener {:address=>"0.0.0.0:5044"}

这里是 netstat输出，

$ sudo netstat -tlnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:5044            0.0.0.0:*               LISTEN      20668/java

我还检查了机器 A 上的防火墙是否已关闭。

$ firewall-cmd --list-all
FirewallD is not running

$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy DROP)
target     prot opt source               destination

我也使用 telnet 连接机器 A，但我明白了，

$ telnet example.com 5044
Trying xx.xx.xx.xx...
telnet: connect to address xx.xx.xx.xx: Connection timed out

我在机器 A(本地)上运行具有相同配置的 filebeat 以检查机器 B(远程)上的 filebeat 配置是否错误，它运行良好。

2019-08-24T14:17:35.195+0800    INFO    pipeline/output.go:95   Connecting to backoff(async(tcp://localhost:5044))
2019-08-24T14:17:35.198+0800    INFO    pipeline/output.go:105  Connection to backoff(async(tcp://localhost:5044)) established

Answer 1

最后发现是VPS Provider aliyun造成的，它只开放了22、80443等一些常用端口。

我需要登录阿里云VPS管理页面，打开5044让VPS Provider绕过5044端口。

*注:* 附:我在使用ELK配置filebeat时遇到的一些其他问题。

**问题 1:** 连接回退失败(async(tcp://ip:5044)): dial tcp ip:5044: connect: connection denied

2019-08-26T10:25:41.955+0800    ERROR   pipeline/output.go:100  Failed to connect to backoff(async(tcp://example.com:5044)): dial tcp xx.xx.xx.xx:5044: connect: connection refused
2019-08-26T10:25:41.955+0800    INFO    pipeline/output.go:93   Attempting to reconnect to backoff(async(tcp://example:5044)) with 2 reconnect attempt(s)

问题 2:无法发布事件导致:write tcp ip:46890->ip:5044: write: connection reset by peer

2019-08-26T10:28:32.274+0800    ERROR   logstash/async.go:256   Failed to publish events caused by: write tcp xx.xx.xx.xx:46890->xx.xx.xx.xx:5044: write: connection reset by peer
2019-08-26T10:28:33.311+0800    ERROR   pipeline/output.go:121  Failed to publish events: write tcp xx.xx.xx.xx:46890->xx.xx.xx.xx:5044: write: connection reset by peer

问题 3: Filebeat 错误:lumberjack 协议(protocol)错误和 Logstash error: OPENSSL_internal:WRONG_VERSION_NUMBER
Filebeat 日志错误，

2019-08-26T08:49:09.505+0800    INFO    pipeline/output.go:95   Connecting to backoff(async(tcp://example.com:5044))
2019-08-26T08:49:09.588+0800    INFO    pipeline/output.go:105  Connection to backoff(async(tcp://example.com:5044)) established
2019-08-26T08:49:09.605+0800    ERROR   logstash/async.go:256   Failed to publish events caused by: lumberjack protocol error
2019-08-26T08:49:09.606+0800    ERROR   logstash/async.go:256   Failed to publish events caused by: client is not connected

Logstash 日志，

[INFO ] 2019-08-26 08:49:29.444 [defaultEventExecutorGroup-4-2] BeatsHandler - [local: 0.0.0.0:5044, remote: undefined] Handling exception: javax.net.ssl.SSLHandshakeException: error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER
[WARN ] 2019-08-26 08:49:29.445 [nioEventLoopGroup-2-7] DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
io.netty.handler.codec.DecoderException: javax.net.ssl.SSLHandshakeException: error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:472) ~[netty-all-4.1.30.Final.jar:4.1.30.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278) ~[netty-all-4.1.30.Final.jar:4.1.30.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[netty-all-4.1.30.Final.jar:4.1.30.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[netty-all-4.1.30.Final.jar:4.1.30.Final]
        ...

这三个问题都是由于未配置造成的，这里是可行的配置，

logstash 版本，

/usr/share/logstash/bin/logstash -V
logstash 7.3.1

文件节拍版本，

/usr/share/filebeat/bin/filebeat version
filebeat version 7.3.1 (amd64), libbeat 7.3.1 [a4be71b90ce3e3b8213b616adfcd9e455513da45 built 2019-08-19 19:30:50 +0000 UTC]

logstash 配置文件 /etc/logstash/conf.d/beat.conf

input {
  beats {
    port => 5044
    ssl => true
    ssl_certificate_authorities => "/etc/pki/tls/certs/logstash-forwarder.crt"
    ssl_certificate => "/etc/pki/tls/certs/logstash-forwarder.crt"
    ssl_key => "/etc/pki/tls/private/logstash-forwarder.key"
    ssl_verify_mode => "peer"
  }
}

output {
  elasticsearch {
    hosts => "http://127.0.0.1:9200"
    manage_template => false
    index => "%{[@metadata][beat]}-%{[@metadata][version]}-%{+YYYY.MM.dd}"
    document_type => "%{[@metadata][type]}"
  }
}

filebeat 配置文件 /etc/filebeat/filebeat.yml

#=========================== Filebeat inputs =============================

filebeat.inputs:

# Each - is an input. Most options can be set at the input level, so
# you can use different inputs for various configurations.
# Below are the input specific configurations.

- type: log

  # Change to true to enable this input configuration.
  enabled: true

  # Paths that should be crawled and fetched. Glob based paths.
  paths:
    - /data/error_logs/Log_error_201908


#----------------------------- Logstash output --------------------------------
output.logstash:
  # The Logstash hosts
  hosts: ["example.com:5044"]

  # Optional SSL. By default is off.
  # List of root certificates for HTTPS server verifications
  ssl.certificate_authorities: ["/etc/pki/tls/certs/logstash-forwarder.crt"]

  # Certificate for SSL client authentication
  ssl.certificate: "/etc/pki/tls/certs/logstash-forwarder.crt"

  # Client Certificate Key
  ssl.key: "/etc/pki/tls/private/logstash-forwarder.key"