This demo illustrates some of the many possible variants of building high availability and balanced infrastructures, based on Acra data protection suite components, PostgreSQL, and Python application protected by Acra. In these examples, we used HAProxy – one of the most popular high availability balancers today.
This project is one of numerous Acra's example applications. If you are curious about other Acra features, like transparent encryption, SQL firewall, load balancing support – Acra Example Applications.
These stands were created only for demonstration purposes and structure of examples was intentionally simplified, HAProxy configuration is optimized NOT for performance, but for clarity of tests.
This demo has two examples:
| One Acra Server, two databases | Two Acra Servers, two databases |
|---|
╭─────────────────╮ ╭─────────────────╮
│ pgsql-master ├─┤ pgsql-slave │
╰────────┬────────╯ ╰────────┬────────╯
╰─────────┬─────────╯
╭────────┴────────╮
│ haproxy │
╰────────┬────────╯
╭────────┴────────╮
│ acra-server │
╰────────┬────────╯
╭────────┴────────╮
│ acra-connector │
╰────────┬────────╯
╭─────────┴─────────╮
╭────────┴────────╮ ╭────────┴────────╮
│ python-example │ │ acra-webconfig │
╰─────────────────╯ ╰─────────────────╯
pgsql-master- tcp/5434 : postgresql (user: postgres, password: test, db: test)
- tcp/9001 : http healtcheck
pgsql-slave- tcp/5435 : postgresql (user: postgres, password: test, db: test)
- tcp/9002 : http healtcheck
haproxy- tcp/5432 : RW access to postgresql cluster
- tcp/5433 : RO access to postgresql cluster
acra-connector- tcp/9494 : acra-connector
acra-webconfig- tcp/8000 : acra-webconfig (user: test, password: test)
# Start
docker-compose -f ./docker-compose.acra-haproxy-pgsql.yml up
# Stop, clean built images, remove keys
docker-compose -f ./docker-compose.acra-haproxy-pgsql.yml down; \
docker image prune --all --force \
--filter "label=com.cossacklabs.product.name=acra-haproxy-pgsql"; \
rm -rf ./.acra{keys,configs}
# Stop only and do not clean built images
docker-compose -f ./docker-compose.acra-haproxy-pgsql.yml down# Trying to write
psql postgres://postgres:test@localhost:9494/postgres?sslmode=disable <<'EOSQL'
CREATE DATABASE "TEST" WITH OWNER="postgres" TEMPLATE=template0 ENCODING='UTF-8';
EOSQL
# CREATE DATABASE
psql postgres://postgres:test@localhost:9494/postgres?sslmode=disable
# postgres=# \l
# List of databases
# Name | Owner | Encoding | Collate | Ctype | Access privileges
# -----------+----------+----------+------------+------------+-----------------------
# TEST | postgres | UTF8 | en_US.utf8 | en_US.utf8 |# Get the name of the python container
DOCKER_PYTHON=$(docker ps \
--filter "label=com.cossacklabs.product.component=acra-python-example" \
--format "{{.Names}}") || echo 'Can not find container!'
# Write data:
docker exec -it $DOCKER_PYTHON \
python /app/example_without_zone.py --data="some data #1"
# insert data: some data #1
# Read data:
docker exec -it $DOCKER_PYTHON python /app/example_without_zone.py --print
# id - data - raw_data
# 1 - some data #1 - some data #1Before testing with zones, open AcraWebConfig and enable zone mode.
# Get the name of the python container
DOCKER_PYTHON=$(docker ps \
--filter "label=com.cossacklabs.product.component=acra-python-example" \
--format "{{.Names}}") || echo 'Can not find container!'
# Write data:
docker exec -it $DOCKER_PYTHON \
python /app/example_with_zone.py --data="some data"
# data: some data
# zone: DDDDDDDDjzaErohiNAaYhChb
# Read data:
ZONE_ID=DDDDDDDDjzaErohiNAaYhChb
docker exec -it $DOCKER_PYTHON \
python /app/example_with_zone.py --print --zone_id=$ZONE_ID
# use zone_id: DDDDDDDDjzaErohiNAaYhChb
# id - zone - data - raw_data
# 1 - DDDDDDDDjzaErohiNAaYhChb - some data - some data╭───────────────────╮ ╭───────────────────╮
│ pgsql-master ├─┤ pgsql-slave │
╰─────────┬─────────╯ ╰─────────┬─────────╯
╭─────────┴─────────╮ ╭─────────┴─────────╮
│ acra-server-m │ │ acra-server-s │
╰─────────┬─────────╯ ╰─────────┬─────────╯
╰──────────┬──────────╯
╭─────────┴─────────╮
│ haproxy │
╰─────────┬─────────╯
╭──────────┴──────────╮
╭─────────┴─────────╮ ╭─────────┴─────────╮
│ acra-connector-rw │ │ acra-connector-ro │
╰─────────┬─────────╯ ╰─────────┬─────────╯
╰──────────┬──────────╯
╭─────────┴─────────╮
│ python-example │
╰───────────────────╯
pgsql-master- tcp/5434 : postgresql (user: postgres, password: test, db: test)
- tcp/9001 : http healtcheck
pgsql-slave- tcp/5435 : postgresql (user: postgres, password: test, db: test)
- tcp/9002 : http healtcheck
haproxy- tcp/9393 : RW access to postgresql cluster through acra-server
- tcp/9394 : RO access to postgresql cluster through acra-server
acra-connector- tcp/9494 : acra-connector-rw
- tcp/9495 : acra-connector-ro
In these examples we have multiple running AcraServers and HAProxy that balancing
connections from AcraConnector. It is currently unsupported to manage multiple
AcraServers through AcraWebConfig in that model and switch between modes
with zones and without zones on the fly.
So you have to run two different docker-compose configurations for next two examples.
# Start
docker-compose -f ./docker-compose.haproxy-acra-pgsql.yml up
# Stop, clean built images, remove keys
docker-compose -f ./docker-compose.haproxy-acra-pgsql.yml down; \
docker image prune --all --force \
--filter "label=com.cossacklabs.product.name=acra-haproxy-pgsql"; \
rm -rf ./.acra{keys,configs}
# Stop only and do not clean built images
docker-compose -f ./docker-compose.haproxy-acra-pgsql.yml down# Get the name of the python container
DOCKER_PYTHON=$(docker ps \
--filter "label=com.cossacklabs.product.component=acra-python-example" \
--format "{{.Names}}") || echo 'Can not find container!'
# Write through RW chain: acra-connector-rw -> haproxy -> pgsql-master
docker exec -it $DOCKER_PYTHON \
python /app/example_without_zone.py --data="some data #1"
# insert data: some data #1
# Read from RO chain: acra-connector-ro <- haproxy <- pgsql-(master|slave)
docker exec -it $DOCKER_PYTHON \
python /app/example_without_zone.py --host acra-connector-ro --print
# id - data - raw_data
# 1 - some data #1 - some data #1# Start
docker-compose -f ./docker-compose.haproxy-acra-pgsql_zonemode.yml up
# Stop, clean built images, remove keys
docker-compose -f ./docker-compose.haproxy-acra-pgsql_zonemode.yml down; \
docker image prune --all --force \
--filter "label=com.cossacklabs.product.name=acra-haproxy-pgsql"; \
rm -rf ./.acra{keys,configs}
# Stop only and do not clean built images
docker-compose -f ./docker-compose.haproxy-acra-pgsql_zonemode.yml down# Get the name of the python container
DOCKER_PYTHON=$(docker ps \
--filter "label=com.cossacklabs.product.component=acra-python-example" \
--format "{{.Names}}") || echo 'Can not find container!'
# Write through RW chain: acra-connector-rw -> haproxy -> pgsql-master
docker exec -it $DOCKER_PYTHON \
python /app/example_with_zone.py --data="some data"
# data: some data
# zone: DDDDDDDDjzaErohiNAaYhChb
# Read from RO chain: acra-connector-ro <- haproxy <- pgsql-(master|slave)
ZONE_ID='DDDDDDDDjzaErohiNAaYhChb'
docker exec -it $DOCKER_PYTHON \
python /app/example_with_zone.py \
--host acra-connector-ro --print --zone_id=$ZONE_ID
# use zone_id: DDDDDDDDjzaErohiNAaYhChb
# id - zone - data - raw_data
# 1 - DDDDDDDDjzaErohiNAaYhChb - some data - some dataLet us know if you have any questions by dropping an email to [email protected].
- Acra features – check out full features set and available licenses.
- Other Acra example applications – try other Acra features, like transparent encryption, SQL firewall, load balancing support.
Need help in configuring Acra? Our support is available for Acra Pro and Acra Enterprise versions.
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