DNS lookup failure "elasticsearch"

Elastic Stack Beats
,
1

I have a simple express app with Nginx and I use Filebeat with ELK stack. Filebeat takes in charge of streaming log file from Nginx to Logstash then processing it and visualize to Kibana. This pipeline works fine. However, I wanted to check how can I incorporate Packetbeat to this pipeline to check the different possibilities that gives to me.

My docker-compose.yml is the following:

version: '3.2'

services:
  elasticsearch:
    build:
      context: elasticsearch/
      args:
        ELK_VERSION: $ELK_VERSION
    volumes:
      - type: bind
        source: ./elasticsearch/config/elasticsearch.yml
        target: /usr/share/elasticsearch/config/elasticsearch.yml
        read_only: true
      - type: volume
        source: elasticsearch
        target: /usr/share/elasticsearch/data
    ports:
      - "9200:9200"
      - "9300:9300"
    environment:
      ES_JAVA_OPTS: "-Xmx256m -Xms256m"
      ELASTIC_PASSWORD: changeme
    networks:
      - elk

  logstash:
    build:
      context: logstash/
      args:
        ELK_VERSION: $ELK_VERSION
    volumes:
      - type: bind
        source: ./logstash/config/logstash.yml
        target: /usr/share/logstash/config/logstash.yml
        read_only: true
      - type: bind
        source: ./logstash/pipeline
        target: /usr/share/logstash/pipeline
        read_only: true
    ports:
      - "5000:5000"
      - "9600:9600"
    expose: 
      - "5044"
    environment:
      LS_JAVA_OPTS: "-Xmx256m -Xms256m"
    networks:
      - elk
    depends_on:
      - elasticsearch

  kibana:
    build:
      context: kibana/
      args:
        ELK_VERSION: $ELK_VERSION
    volumes:
      - type: bind
        source: ./kibana/config/kibana.yml
        target: /usr/share/kibana/config/kibana.yml
        read_only: true
    ports:
      - "5601:5601"
    networks:
      - elk
    depends_on:
      - elasticsearch

  app:
    build : ./app
    volumes:
      - ./app/:/usr/src/app
      - /usr/src/app/node_modules/ # make node_module empty in container
    command: npm start
    ports:
      - "3000:3000"
    networks:
      - elk

  nginx:
    build: ./nginx
    volumes:
      - ./nginx/config:/etc/nginx/conf.d
      - ./nginx/log:/var/log/nginx
    ports:
      - "80:80"
      - "443:443"
    links:
      - app:app
    depends_on: 
      - app
    networks:
      - elk

  filebeat:
    build: ./filebeat
    entrypoint: "filebeat -e -strict.perms=false"
    volumes:
      - ./filebeat/config/filebeat.yml:/usr/share/filebeat/filebeat.yml
      - ./nginx/log:/var/log/nginx
    networks:
      - elk
    depends_on: 
      - app
      - nginx
      - logstash
      - elasticsearch
      - kibana
    links: 
      - logstash

  packetbeat:
    build: ./packetbeat
    restart: always
    cap_add:
      - NET_ADMIN
    volumes:
      - type: bind
        source: ./packetbeat/config/packetbeat.yml
        target: /usr/share/packetbeat/config/packetbeat.yml
        read_only: true
    network_mode: host

networks:
  elk:
    driver: bridge

volumes:
  elasticsearch:
  packetbeat:

The packetbeat.yml for configuration is the following:

packetbeat.interfaces.device: any

packetbeat.flows:
  timeout: 30s
  period: 5s

packetbeat.protocols:

- type: icmp
  enabled: true

- type: dns
  ports: [53]
  include_authorities: true
  include_additionals: true

- type: http
  ports: [80, 5601, 9200, 8080, 8081, 5000, 8002]

- type: amqp
  ports: [5672]

- type: cassandra
  ports: [9042]

- type: memcache
  ports: [11211]

- type: mysql
  ports: [3306]

- type: mongodb
  ports: [27017]

- type: redis
  ports: [6379]

- type: pgsql
  ports: [5432]

- type: thrift
  ports: [9090]

processors:
- add_cloud_metadata:

#-------------------------- Elasticsearch output ------------------------------
output.elasticsearch:
  hosts: ["http://elasticsearch:9200"]
  username: "elastic"
  password: "changeme"

setup.kibana:
  host: "http://kibana:5601"
  username: "elastic"
  password: "changeme"

#============================== Dashboards =====================================
# These settings control loading the sample dashboards to the Kibana index. Loading
# the dashboards is disabled by default and can be enabled either by setting the
# options here, or by using the `-setup` CLI flag.
setup.dashboards.enabled: true

logging.level: warning
logging.to_files: true
logging.to_syslog: false
logging.files:
  path: /var/log/packetbeat
  name: packetbeat.log
  keepfiles: 2
  permissions: 0644

The logs from the packetbeat are the following:

2022-05-30T10:46:50.621Z        INFO    instance/beat.go:606    Home path: [/usr/share/packetbeat] Config path: [/usr/share/packetbeat] Data path: [/usr/share/packetbeat/data] Logs path: [/usr/share/packetbeat/logs]
2022-05-30T10:46:50.627Z        INFO    instance/beat.go:614    Beat ID: ce831d3c-5dce-44f0-8353-c9bca19bf24d
2022-05-30T10:46:50.645Z        INFO    [seccomp]       seccomp/seccomp.go:124  Syscall filter successfully installed
2022-05-30T10:46:50.645Z        INFO    [beat]  instance/beat.go:902    Beat info       {"system_info": {"beat": {"path": {"config": "/usr/share/packetbeat", "data": "/usr/share/packetbeat/data", "home": "/usr/share/packetbeat", "logs": "/usr/share/packetbeat/logs"}, "type": "packetbeat", "uuid": "ce831d3c-5dce-44f0-8353-c9bca19bf24d"}}}
2022-05-30T10:46:50.645Z        INFO    [beat]  instance/beat.go:911    Build info      {"system_info": {"build": {"commit": "a4be71b90ce3e3b8213b616adfcd9e455513da45", "libbeat": "7.3.1", "time": "2019-08-19T19:23:55.000Z", "version": "7.3.1"}}}
2022-05-30T10:46:50.645Z        INFO    [beat]  instance/beat.go:914    Go runtime info {"system_info": {"go": {"os":"linux","arch":"amd64","max_procs":12,"version":"go1.12.4"}}}
2022-05-30T10:46:50.647Z        INFO    [beat]  instance/beat.go:918    Host info       {"system_info": {"host": {"architecture":"x86_64","boot_time":"2022-05-30T06:32:16Z","containerized":true,"name":"docker-desktop","ip":["127.0.0.1/8","::1/128","192.168.65.4/32","fe80::540e:a7ff:fe70:721c/64","192.168.65.3/24","fe80::50:ff:fe00:1/64","172.17.0.1/16","172.21.0.1/16","172.20.0.1/16","172.31.0.1/16","172.30.0.1/16","172.24.0.1/16"],"kernel_version":"5.10.16.3-microsoft-standard-WSL2","mac":["56:0e:a7:70:72:1c","02:50:00:00:00:01","02:42:d5:46:bb:83","02:42:c0:78:f6:49","02:42:1d:e7:31:90","02:42:ef:1d:59:0b","02:42:11:ae:79:7b","02:42:b6:15:d2:c9","06:3e:db:fc:bc:40","da:60:24:42:a1:57","b2:4b:44:ef:47:21","7a:11:9f:73:e0:fb"],"os":{"family":"redhat","platform":"centos","name":"CentOS Linux","version":"7 (Core)","major":7,"minor":6,"patch":1810,"codename":"Core"},"timezone":"UTC","timezone_offset_sec":0}}} 
2022-05-30T10:46:50.647Z        INFO    [beat]  instance/beat.go:947    Process info    {"system_info": {"process": {"capabilities": {"inheritable":["chown","dac_override","fowner","fsetid","kill","setgid","setuid","setpcap","net_bind_service","net_admin","net_raw","sys_chroot","mknod","audit_write","setfcap"],"permitted":["net_admin","net_raw"],"effective":["net_admin","net_raw"],"bounding":["chown","dac_override","fowner","fsetid","kill","setgid","setuid","setpcap","net_bind_service","net_admin","net_raw","sys_chroot","mknod","audit_write","setfcap"],"ambient":null}, "cwd": "/usr/share/packetbeat", "exe": "/usr/share/packetbeat/packetbeat", "name": "packetbeat", "pid": 1, "ppid": 0, "seccomp": {"mode":"filter","no_new_privs":true}, "start_time": "2022-05-30T10:46:49.520Z"}}}
2022-05-30T10:46:50.647Z        INFO    instance/beat.go:292    Setup Beat: packetbeat; Version: 7.3.1
2022-05-30T10:46:50.648Z        INFO    [index-management]      idxmgmt/std.go:178      Set output.elasticsearch.index to 'packetbeat-7.3.1' as ILM is enabled.
2022-05-30T10:46:50.648Z        INFO    elasticsearch/client.go:170     Elasticsearch url: http://elasticsearch:9200
2022-05-30T10:46:50.648Z        INFO    [publisher]     pipeline/module.go:97   Beat name: docker-desktop
2022-05-30T10:46:50.648Z        INFO    procs/procs.go:105      Process watcher disabled
2022-05-30T10:46:50.649Z        WARN    [cfgwarn]       protos/protos.go:118    DEPRECATED: dictionary style protocols configuration has been deprecated. Please use list-style protocols configuration. Will be removed in version: 7.0.0
2022-05-30T10:46:50.649Z        INFO    [monitoring]    log/log.go:118  Starting metrics logging every 30s
2022-05-30T10:46:50.650Z        INFO    instance/beat.go:421    packetbeat start running.
2022-05-30T10:46:53.628Z        INFO    add_cloud_metadata/add_cloud_metadata.go:347    add_cloud_metadata: hosting provider type not detected.
2022-05-30T10:46:54.629Z        INFO    pipeline/output.go:95   Connecting to backoff(elasticsearch(http://elasticsearch:9200))
2022-05-30T10:47:04.630Z        WARN    transport/tcp.go:53     DNS lookup failure "elasticsearch": lookup elasticsearch on 192.168.65.5:53: read udp 192.168.65.4:41347->192.168.65.5:53: i/o timeout
2022-05-30T10:47:05.932Z        ERROR   pipeline/output.go:100  Failed to connect to backoff(elasticsearch(http://elasticsearch:9200)): Get http://elasticsearch:9200: lookup elasticsearch on 192.168.65.5:53: read udp 192.168.65.4:41347->192.168.65.5:53: i/o timeout
2022-05-30T10:47:05.932Z        INFO    pipeline/output.go:93   Attempting to reconnect to backoff(elasticsearch(http://elasticsearch:9200)) with 1 reconnect attempt(s)
2022-05-30T10:47:10.266Z        WARN    transport/tcp.go:53     DNS lookup failure "elasticsearch": lookup elasticsearch on 192.168.65.5:53: no such host
2022-05-30T10:47:13.032Z        ERROR   pipeline/output.go:100  Failed to connect to backoff(elasticsearch(http://elasticsearch:9200)): Get http://elasticsearch:9200: lookup elasticsearch on 192.168.65.5:53: no such host
2022-05-30T10:47:13.033Z        INFO    pipeline/output.go:93   Attempting to reconnect to backoff(elasticsearch(http://elasticsearch:9200)) with 2 reconnect attempt(s)
2022-05-30T10:47:17.355Z        WARN    transport/tcp.go:53     DNS lookup failure "elasticsearch": lookup elasticsearch on 192.168.65.5:53: no such host
2022-05-30T10:47:20.652Z        INFO    [monitoring]    log/log.go:145  Non-zero metrics in the last 30s        {"monitoring": {"metrics": {"beat":{"cpu":{"system":{"ticks":140,"time":{"ms":150}},"total":{"ticks":520,"time":{"ms":532},"value":0},"user":{"ticks":380,"time":{"ms":382}}},"handles":{"limit":{"hard":1048576,"soft":1048576},"open":6},"info":{"ephemeral_id":"878eb582-5eb7-4eca-a8c9-6b6523eb642f","uptime":{"ms":30041}},"memstats":{"gc_next":38388752,"memory_alloc":25277368,"memory_total":44835472,"rss":179154944},"runtime":{"goroutines":30}},"dns":{"unmatched_responses":3},"libbeat":{"config":{"module":{"running":0}},"output":{"type":"elasticsearch"},"pipeline":{"clients":11,"events":{"active":108,"published":108,"retry":6,"total":108}}},"system":{"cpu":{"cores":12},"load":{"1":4.23,"15":1.03,"5":2.08,"norm":{"1":0.3525,"15":0.0858,"5":0.1733}}}}}}

Any idea of where is the mistake?

2

HI,

I would check first if DNS works correctly. Try to ssh to the container and ping elasticsearch and other hosts too.

1 Like
3

It's most likely because packetbeat container is in host network mode, outside of the standard docker network that's able to resolve container names.

1 Like
4

I am getting the following after doing curl -GET http://localhost:9200 inside packetbeat container:

{"error":{"root_cause":[{"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":"Basic realm=\"security\" charset=\"UTF-8\""}}],"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":"Basic realm=\"security\" charset=\"UTF-8\""}

However, if I add the credentials with curl -X GET "http://localhost:9200" -u elastic:changeme I am getting the following:

{
  "name" : "828f3f322ef7",
  "cluster_name" : "docker-cluster",
  "cluster_uuid" : "avD7igm-TCmk0WelAzHegw",
  "version" : {
    "number" : "7.3.1",
    "build_flavor" : "default",
    "build_type" : "docker",
    "build_hash" : "4749ba6",
    "build_date" : "2019-08-19T20:19:25.651794Z",
    "build_snapshot" : false,
    "lucene_version" : "8.1.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}
5

How can I fix that? Should I change network_mode: host to networks: elk?

6

if ur trying to capture traffic at the host level, it needs to be host network. u could try to expose elastic outside of the docker network and point packetbeat to 127.0.0.1:9200

7

I am getting the following after doing curl -GET http://localhost:9200 inside packetbeat container:

{"error":{"root_cause":[{"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":"Basic realm=\"security\" charset=\"UTF-8\""}}],"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":"Basic realm=\"security\" charset=\"UTF-8\""}

Are y using beats agent in docker?

I don't think you can curl using localhost as your dns address. Have y tried using the host ip?

you can put localhost there if you define it in /etc/hosts in the node that you work on.

I can see your problem that you mentioned in your main post is actually here:

Connecting to backoff(elasticsearch(http://elasticsearch:9200)

try to use this command to verify the ip address and port where the elastic will listen to.
netstat -tnulp

8

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