Flight recordings and mission control through thick clouds

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Martin (高馬丁) Skarsaune

My JavaZone 2021 talk: https://2021.javazone.no/#/program/20fef63e-58d5-40e0-854f-15eb38defac8

Internet

Java mission control
and flight recorder
- Through thick clouds
@MSkarsaune

Prod deploy!
*) scene from «Mysterious Life of Developers»

Technical incident!
- Crashes
- Degraded performance
- Inreased CPU consumption
- Thread starvation
- Memory leak
- Increased footprint
- Resource leak

Firefighting!
- Monitoring
- Version control
- Logs
- More logs
- Code review
- Load testing

Mission control and
Flight recorder
- Records exactly what is going on
- Offline analysis
- Reports and plugins
- Suitable for production systems
- No extra deployment
- Open source
- Jmc independent project

JMX
- JSR-003
- Mbeans
- System/3rdparty/application
- Attributes
- Operations
- RMI protocol

Up into the clouds
- Pods come and go
- Not reachable over network
- No console access
- Lacking tools
- No access to files

RMI
- Remote method invocation
- JSR-160
- Binary protocol
- Java only
- Complex
- Firewalls

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=<port>
-Dcom.sun.management.jmxremote.rmi.port=<port>
-Djava.rmi.server.hostname=127.0.0.1
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.local.only=false
Work that RMI magic

Step 1: Jolokia
- JSON + HTTP JMX bridge
- May be included in your stack
- Flexible integration
- granular security
- Broadcast/discovery
- jolokia.org
- Jz2016:
https://vimeo.com/181896821
JVM
JMX
Jolokia
JSON + HTTP

Step 2: Kubernetes
proxy
- Use the kubernetes API to proxy
to a service or pod

proxy API
Ingress
Service
Pod
Pod
Proxy
API
jolokia
$apiBaseUrl/v1/api/namespaces/<ns>/pods/<(proto:)<pod>(:port)>/proxy/<path>
8080
8080
8778
Authorization:
<token>
Authorization:
<token>
X-Jolokia-Authorization:
<cred>

Alternative: hawt.io
- Web console
- Plugins
- May be included in stack
- Supports jolokia discovery
- JavaZone 2017:
https://vimeo.com/233817010

Enter
Ingress
Service
Pod
Pod
Service
Pod
j
o
l
o
k
i
a

References
• jolokia.org – everything Jolokia
• https://www.oracle.com/java/technolo
gies/jdk-mission-control.html - JMC
• https://github.com/skarsaune/jmc-
cloud-extensions/ - Jolokia plugins for
JMC and visual VM

Thank you for
your time!
@MSkarsaune
@kantega
@jolokia_jmx
@JavaZone
@javamissionctrl
@hawtio

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