I'm using kube-fluentd-operator to aggregate logs using fluentd into Elasticsearch and query them in Kibana.
I can see my application (pods) logs inside the cluster.
However I cannot see the journal logs (systemd units, kubelet, etc) from the hosts inside the cluster.
There are no noticeable messages in fluentd's pods logs and the stack works for logs coming from applications.
Inside the fluentd container I have access to the /var/log/journal directory (drwxr-sr-x 3 root 101 4096 May 21 12:37 journal).
Where should I look next to get the journald logs in my EFK stack?
Here's the kube-system.conf file attached to the kube-system namespace:
<match systemd.** kube.kube-system.** k8s.** docker>
# all k8s-internal and OS-level logs
#type elasticsearch
host "logs-es-http.logs"
port "9200"
scheme "https"
ssl_verify false
user "u1"
password "password"
logstash_format true
#with_transporter_log true
##log_level debug
validate_client_version true
ssl_version TLSv1_2
</match>
Minimal, simple, according to the docs.
Is it possible that my search terms are wrong?
What should I search for in order to get the journal logs?
After having tried every possible solution (from enabling log_level debug, to only having the kube-system namespace monitored, to adding runAsGroup: 101 to the containers) all I was left with was changing what I was using for log aggregation and decided to switch from that operator to the DaemonSet provided by fluent themselves: https://github.com/fluent/fluentd-kubernetes-daemonset
This switch has proved successful and the search of the systemd units works from inside the EFK stack.
Related
I have deployed fluentd and elastic search in k8s. If I check the log of the fluentd pod it logs: The client is unable to verify that the server is Elasticsearch. Some functionality may not be compatible if the server is running an unsupported product.
My fluentd.conf is:
<match kubernetes.var.log.containers.** >
#type elasticsearch
host http://elasticsearch
port 9200
logstash_format true
</match>
How do I send the docker container logs to elastic search.
I am setting up an ELK Stack (which consists of ElasticSearch, LogStash and Kibana) in a single EC2 instance. AWS EC2 instance. I am following the documentation from the elastic.co site.
TL;DR; I cannot access my ElasticSearch interface hosted in an EC2 from the Web URL. How to fix that?
Type : m4.large
vCPU : 2
Memory : 8 GB
Storage: 25 GB (EBS)
Note : I have provisioned the EC2 instance inside a VPC and with an Elastic IP.
I have installed all 3 components. ElasticSearch and LogStash are running as services while Kibana is running via the command ./bin/kibana inside kibana-7.10.1-linux-x86_64/ directory.
When I curl the ElasticSearch endpoint using
curl http://localhost:9200
I get this JSON output. (Which means the service is running and is accessible via Port 9200).
However, when I try to access the same URL via my browser, I get an error saying
Connection Timed Out
Isn't this supposed to return the same JSON output as the one I've mentioned above?
I have attached the elasticsearch.yml file here (Hosted in gofile.io).
Here are the Inbound Rules for the EC2 instance.
EDIT : I tried changing the network.host: 'localhost'
to network.host: 0.0.0.0 and restarted the service but this time I got an error while starting the service. I attached the screenshot of that.
EDIT 2 : I have uploaded the updated elasticsearch.yml to Gofile.org).
The problem is the following line in your elasticsearch.yml configuration file:
node.name: node-1
network.host: 'localhost'
With that configuration, your ES cluster is only accessible from the same host and not from the outside. According to the official documentation, you need to either specify 0.0.0.0 or a specific publicly accessible IP address, otherwise that won't work.
Note that you also need to configure the following two lines in order for the cluster to properly form:
discovery.seed_hosts: ["node-1-ip-address"]
# Bootstrap the cluster using an initial set of master-eligible nodes:
cluster.initial_master_nodes: ["node-1"]
I am assigned with task to create a central logging server. In my case there are many web app servers spread across. My task is to get logs from these different servers and manage in central server where there will be elastic-search and kibana.
Question
Is it possible to get logs from servers that are having different public IP? If possible how?
How much resource (CPU, Memory, Storage) is required in central server.
Things seen
Saw the examples setups where all logs and applications are on same machine only.
Looking for way to send logs over public IP to elastic-search.
I would like to differ from the Ishara's Answer. You can ship logs directly from filebeat to elasticsearch without using logstash, If your logs are generic types(system logs, nginx logs, apache logs), Using this approach You don't need to go into incur extra cost and maintenance of logstash as filebeat provides inbuilt parsing processor.
If you have debian based OS on your server, I have prepared a shell script to install and configure filebeat. You need to change elasticsearch server URL and modify second last line based on the modules that you want to configure.
Regarding your first question, Yes, You can run filebeat agent on each server and send data to centralize Elasticsearch.
For your second question, It depends on the amount of logs elasticsearch server is going to process and store. It also depends on the where kibana is hosted.
sudo wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
sudo echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-7.x.list
sudo apt-get update && sudo apt-get install -y filebeat
sudo systemctl enable filebeat
sudo bash -c "cat >/etc/filebeat/filebeat.yml" <<FBEOL
filebeat.inputs:
filebeat.config.modules:
path: ${path.config}/modules.d/*.yml
reload.enabled: false
setup.template.name: "filebeat-system"
setup.template.pattern: "filebeat-system-*"
setup.template.settings:
index.number_of_shards: 1
setup.ilm.enabled: false
setup.kibana:
output.elasticsearch:
hosts: ["10.32.66.55:9200", "10.32.67.152:9200", "10.32.66.243:9200"]
indices:
- index: "filebeat-system-%{+yyyy.MM.dd}"
when.equals:
event.module: system
processors:
- add_host_metadata: ~
- add_cloud_metadata: ~
- add_docker_metadata: ~
- add_kubernetes_metadata: ~
logging.level: warning
FBEOL
sudo filebeat modules enable system
sudo systemctl restart filebeat
Yes, it is possible to get logs from servers that are having different public IP. You need to setup an agent like filebeat (provided by elastic) to each server which produce logs.
You need to setup filebeat instance in each machine.
It will listen to your log files in each machine and forward them to the logstash instance you would mention in filebeat.yml configuration file like below:
#=========================== Filebeat inputs =============================
filebeat.inputs:
- type: log
# Change to true to enable this input configuration.
enabled: true
# Paths that should be crawled and fetched. Glob based paths.
paths:
- /path_to_your_log_1/ELK/your_log1.log
- /path_to_your_log_2/ELK/your_log2.log
#----------------------------- Logstash output --------------------------------
output.logstash:
# The Logstash hosts
hosts: ["private_ip_of_logstash_server:5044"]
Logstash server listens to port 5044 and stream all logs through logstash configuration files:
input {
beats { port => 5044 }
}
filter {
# your log filtering logic is here
}
output {
elasticsearch {
hosts => [ "elasticcsearch_server_private_ip:9200" ]
index => "your_idex_name"
}
}
In logstash you can filter and split your logs into fields and send them to elasticsearch.
Resources depend on how much of data you produce, data retention plan, TPS and your custom requirements. If you can provide some more details, I would be able to provide a rough idea about resource requirement.
I'm trying to send specific openshift project logs to unsecured external elastic search.
I have tried solution which is there in https://github.com/richm/docs/releases/tag/20190205142308. But found that it will work only when ELS is secured.
Later I have tried using elasticsearch plugin also by adding in output-applications.conf.
output-applications.conf:
<match *.*>
#type elasticsearch
host xxxxx
port 9200
logstash_format true
</match>
All other files are same which is described in https://github.com/richm/docs/releases/tag/20190205142308 #Application logs from specific namespaces/pods/containers
Included output-applications.conf in fluent.conf file.
In fluentd logs except "[info]: reading config file path="/etc/fluent/fluent.conf" " this message i dont see any other things and data is not reaching to elasticsearch
Can anyone tell how to proceed?
I have a local setup running 2 conainers -
One for Elasticsearch (setup for development as detailed here - https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html). This I run as directed in the article using - docker run -p 9200:9200 -e "http.host=0.0.0.0" -e "transport.host=127.0.0.1" docker.elastic.co/elasticsearch/elasticsearch:5.4.1
Another as a Fluentd aggregator (using this base image - https://hub.docker.com/r/fluent/fluentd/). My fluent.conf for testing purposes is as follows :
<source>
#type forward
port 24224
</source>
<match **>
#type elasticsearch
host 172.17.0.2 # Verified internal IP address of the ES container
port 9200
user elastic
password changeme
index_name fluentd
buffer_type memory
flush_interval 60
retry_limit 17
retry_wait 1.0
include_tag_key true
tag_key docker.test
reconnect_on_error true
</match>
This I start with the command - docker run -p 24224:24224 -v /data:/fluentd/log vg/fluentd:latest
When I run my processes (that generate logs), and run these 2 containers, I see the following towards the end of stdout for the Fluentd container -
2017-06-15 12:16:33 +0000 [info]: Connection opened to Elasticsearch cluster => {:host=>"172.17.0.2", :port=>9200, :scheme=>"http", :user=>"elastic", :password=>"obfuscated"}
However, beyond this, I see no logs. When I login to http://localhost:9200 I only see the Elasticsearch welcome message.
I know the logs are reaching the Fluentd container, because when I change fluent.conf to redirect to a file, I see all the logs as expected. What am I doing wrong in my setup of Elasticsearch? How can I get to seeing all the indexes laid out correctly in my browser / through Kibana?
It seems that you are in the right track. Just check the indexes that were created in elasticsearch as follows:
curl 'localhost:9200/_cat/indices?v'
Docs:
https://www.elastic.co/guide/en/elasticsearch/reference/1.4/_list_all_indexes.html
There you can see each index name. So pick one and search within it:
curl 'localhost:9200/INDEXNAME/_search'
Docs: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-search.html
However I recommend you to use kibana in order to have a better human experience. Just start it and by default it searches for an elastic in localhost. In the interface's config put the index name that you now know, and start to play with it.