Microservices Python bangkok

30 seconds about me
• DigitalOcean.
• Thomson Reuters.
• Go Developer 5 years
• Spoken all over the world
• DevOps Startup
• Rode an elephant at my wedding

Microservices are an
organizational scaling tool

Protobuf deﬁnition
package helloworld;
// The greeting service definition.
service Greeter {
// Sends a greeting
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
// The request message containing the user's name.
message HelloRequest {
string name = 1;
}
// The response message containing the greetings
message HelloReply {
string message = 1;
}

Environment variables
from envparse import env
env.read_envfile()
print('ACCESS =', env.str('AWS_ACCESS_KEY'))
print('SECRET =', env.str('AWS_SECRET_KEY'))
print('CONSULTING_LEVEL =', env.str('CONSULTING_LEVEL'))
print('OTHER =', env.str('OTHER', default='foo'))

Metrics
from prometheus_client import Gauge
g = Gauge('my_inprogress_requests', 'Description of gauge')
g.inc() # Increment by 1
g.dec(10) # Decrement by given value
g.set(4.2) # Set to a given value
from prometheus_client import Histogram
h = Histogram('request_latency_seconds', 'Description of histogram')
h.observe(4.7) # Observe 4.7 (seconds in this case)
from prometheus_client import Counter
c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
c.labels(method='get', endpoint='/').inc()
c.labels(method='post', endpoint='/submit').inc()

REK Stack
• Rsyslog
• Elastic Search
• Kibana

Structured logging
{
"program": "microservice1", "host": "box01",
"log_level": "info", "msg": "Api Request recieved",
"user_id": "12345", "rpc_method": "post_add_tick"
}

Logging
from structlog import get_logger
log = get_logger()
log.info("key_value_logging", out_of_the_box=True, effort=0)
log = log.bind(user="anonymous", some_key=23)
log = log.bind(user="hynek", another_key=42)
log.info("user.logged_in", happy=True)

Docker ﬁle example
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
CMD [ "python", "./your-daemon-or-script.py" ]

Docker build
docker build -t myapp:version .

Docker Run
docker run -V /dev/log:/dev/log -E=addr=:8080 myapp:version

Breakdown
• Syslog -> -V /dev/log:/devlog
• ENV Vars -> -E addr=:8080
• Application container -> myapp:version

Cloud
• Aws Container engine
• Google Container Engine (GKE)
• Private install of Kubernetes

Microservices Python bangkok

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