4.3. Logs User Guide¶

4.3.1. Prerequisites¶

Require 3 VMs to setup K8s
$ sudo yum install ansible
$ pip install openshift pyyaml kubernetes (required for ansible K8s module)

Update IPs in all these files (if changed)

Path	Description
`ansible-server/group_vars/all.yml`	IP of K8s apiserver and VM hostname
`ansible-server/hosts`	IP of VMs to install
`ansible-server/roles/logging/files/persistentVolume.yaml`	IP of NFS-Server
`ansible-server/roles/logging/files/elastalert/ealert-rule-cm.yaml`	IP of alert-receiver

4.3.2. Architecture¶

4.3.3. Installation - Clientside¶

4.3.3.1. Nodes¶

Node1 = 10.10.120.21
Node4 = 10.10.120.24

4.3.3.2. How installation is done?¶

TD-agent installation
$ curl -L https://toolbelt.treasuredata.com/sh/install-redhat-td-agent3.sh | sh
Copy the TD-agent config file in Node1
$ cp tdagent-client-config/node1.conf /etc/td-agent/td-agent.conf
Copy the TD-agent config file in Node4
$ cp tdagent-client-config/node4.conf /etc/td-agent/td-agent.conf
Restart the service
$ sudo service td-agent restart

4.3.4. Installation - Serverside¶

4.3.4.1. Nodes¶

Inside Jumphost - POD12

VM1 = 10.10.120.211
VM2 = 10.10.120.203
VM3 = 10.10.120.204

4.3.4.2. How installation is done?¶

Using Ansible:

K8s
- Elasticsearch: 1 Master & 1 Data node at each VM
- Kibana: 1 Replicas
- Nginx: 2 Replicas
- Fluentd: 2 Replicas
- Elastalert: 1 Replica (get duplicate alert, if increase replica)
NFS Server: at each VM to store elasticsearch data at following path
- /srv/nfs/master
- /srv/nfs/data

4.3.4.3. How to setup?¶

To setup K8s cluster and EFK: Run the ansible-playbook ansible/playbooks/setup.yaml
To clean everything: Run the ansible-playbook ansible/playbooks/clean.yaml

4.3.4.4. Do we have HA?¶

Yes

4.3.5. Configuration¶

4.3.5.1. K8s¶

4.3.5.1.1. Path of all yamls (Serverside)¶

ansible-server/roles/logging/files/

4.3.5.1.2. K8s namespace¶

logging

4.3.5.1.3. K8s Service details¶

$ kubectl get svc -n logging

4.3.5.2. Elasticsearch Configuration¶

4.3.5.2.1. Elasticsearch Setup Structure¶

4.3.5.2.2. Elasticsearch service details¶

Service Name: logging-es-http
Service Port: 9200
Service Type: ClusterIP

4.3.5.2.3. How to get elasticsearch default username & password?¶

User1 (custom user):

Username: elasticsearch

Password: password123
User2 (by default created by Elastic Operator):

Username: elastic

To get default password:

$ PASSWORD=$(kubectl get secret -n logging logging-es-elastic-user -o go-template='{{.data.elastic | base64decode}}')

$ echo $PASSWORD

4.3.5.2.4. How to increase replica of any index?¶

$ curl -k -u “elasticsearch:password123” -H ‘Content-Type: application/json’ -XPUT “https://10.10.120.211:9200/indexname*/_settings” -d ‘

{

“index” : {

“number_of_replicas” : “2” }

}’

4.3.5.2.5. Index Life¶

30 Days

4.3.5.3. Kibana Configuration¶

4.3.5.3.1. Kibana Service details¶

Service Name: logging-kb-http
Service Port: 5601
Service Type: ClusterIP

4.3.5.4. Nginx Configuration¶

4.3.5.4.1. IP¶

The IP address with https. Ex: “10.10.120.211:32000”

4.3.5.4.2. Nginx Setup Structure¶

4.3.5.4.3. Ngnix Service details¶

Service Name: nginx
Service Port: 32000
Service Type: NodePort

4.3.5.4.4. Why NGINX is used?¶

Securing ELK using Nginx

4.3.5.4.5. Nginx Configuration¶

Path: ansible-server/roles/logging/files/nginx/nginx-conf-cm.yaml

4.3.5.5. Fluentd Configuration - Clientside (Td-agent)¶

4.3.5.5.1. Fluentd Setup Structure¶

4.3.5.5.2. Log collection paths¶

/tmp/result*/*.log
/tmp/result*/*.dat
/tmp/result*/*.csv
/tmp/result*/stc-liveresults.dat.*
/var/log/userspace*.log
/var/log/sriovdp/*.log.*
/var/log/pods/**/*.log

4.3.5.5.3. Logs sent to¶

Another fluentd instance of K8s cluster (K8s Master: 10.10.120.211) at Jumphost.

4.3.5.5.4. Td-agent logs¶

Path of td-agent logs: /var/log/td-agent/td-agent.log

4.3.5.5.5. Td-agent configuration¶

Path of conf file: /etc/td-agent/td-agent.conf

If any changes is made in td-agent.conf then restart the td-agent service, $ sudo service td-agent restart

4.3.5.5.6. Config Description¶

Get the logs from collection path
Convert to this format

{

msg: “log line”

log_path: “/file/path”

file: “file.name”

host: “pod12-node4”

}
Sends it to fluentd

4.3.5.6. Fluentd Configuration - Serverside¶

4.3.5.6.1. Fluentd Setup Structure¶

4.3.5.6.2. Fluentd Service details¶

Service Name: fluentd
Service Port: 32224
Service Type: NodePort

4.3.5.6.3. Logs sent to¶

Elasticsearch service (Example: logging-es-http at port 9200)

4.3.5.6.4. Config Description¶

Step 1
- Get the logs from Node1 & Node4

Step 2

log_path	add tag (for routing)
`/tmp/result./.errors.dat`	errordat.log
`/tmp/result./.counts.dat`	countdat.log
`/tmp/result.*/stc-liveresults.dat.tx`	stcdattx.log
`/tmp/result.*/stc-liveresults.dat.rx`	stcdatrx.log
`/tmp/result./.Statistics.csv`	ixia.log
`/tmp/result./vsperf-overall`	vsperf.log
`/tmp/result./vswitchd`	vswitchd.log
`/var/log/userspace*`	userspace.log
`/var/log/sriovdp*`	sriovdp.log
`/var/log/pods*`	pods.log

Step 3
Then parse each type using tags.
error.conf: to find any error

time-series.conf: to parse time series data

time-analysis.conf: to calculate time analyasis
Step 4

host

add tag (for routing)

pod12-node4

node4

worker

node1
Step 5

Tag

elasticsearch

node4

index “node4*”

node1

index “node1*”

host	add tag (for routing)
`pod12-node4`	node4
`worker`	node1

Tag	elasticsearch
`node4`	index “node4*”
`node1`	index “node1*”

4.3.6. Elastalert¶

4.3.6.1. Send alert if¶

Blacklist
- “Failed to run test”
- “Failed to execute in ‘30’ seconds”
- “(‘Result’, ‘Failed’)”
- “could not open socket: connection refused”
- “Input/output error”
- “dpdk|ERR|EAL: Error - exiting with code: 1”
- “Failed to execute in ‘30’ seconds”
- “dpdk|ERR|EAL: Driver cannot attach the device”
- “dpdk|EMER|Cannot create lock on”
- “dpdk|ERR|VHOST_CONFIG: * device not found”
Time
- vswitch_duration > 3 sec

4.3.6.2. How to configure alert?¶

Add your rule in ansible/roles/logging/files/elastalert/ealert-rule-cm.yaml (Elastalert Rule Config)

name: anything

type: <check-above-link> #The RuleType to use

index: node4* #index name

realert:

minutes: 0 #to get alert for all cases after each interval

alert: post #To send alert as HTTP POST

http_post_url: # Provide URL
Mount this file to elastalert pod in ansible/roles/logging/files/elastalert/elastalert.yaml.

4.3.6.3. Alert Format¶

{“type”: “pattern-match”, “label”: “failed”, “index”: “node4-20200815”, “log”: “error-log-line”, “log-path”: “/tmp/result/file.log”, “reson”: “error-message” }

4.3.7. Data Management¶

4.3.7.1. Elasticsearch¶

4.3.7.1.1. Q&As¶

Where data is stored now? Data is stored in NFS server with 1 replica of each index (default). Path of data are following:

/srv/nfs/data (VM1)

/srv/nfs/data (VM2)

/srv/nfs/data (VM3)

/srv/nfs/master (VM1)

/srv/nfs/master (VM2)

/srv/nfs/master (VM3)

If user wants to change from NFS to local storage, can he do it? Yes, user can do this, need to configure persistent volume. (ansible-server/roles/logging/files/persistentVolume.yaml)

Do we have backup of data? Yes. 1 replica of each index

When K8s restart, the data is still accessible? Yes (If data is not deleted from /srv/nfs/data)