[opentelemetry-demo] add postgresql in helm chart

[cuichenli]

this is a follow up of open-telemetry/opentelemetry-demo#2175

[TylerHelmuth]

@puckpuck please take a look

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[cuichenli]

bump

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.

[dmitryax]

@cuichenli please bump the chart version

[cuichenli]

@cuichenli please bump the chart version

updated.

[TylerHelmuth]

@cuichenli have you tested this change and confirmed the postgres instance starts correctly and things can communicate with it?

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[ebarped]

I tested the chart and i can confirm @TylerHelmuth:

• that posgresql starts correctly and executes the init script:

The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/postgresql/data ... ok
creating subdirectories ... ok
selecting dynamic shared memory implementation ... posix
selecting default "max_connections" ... 100
selecting default "shared_buffers" ... 128MB
selecting default time zone ... Etc/UTC
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok


Success. You can now start the database server using:

    pg_ctl -D /var/lib/postgresql/data -l logfile start

initdb: warning: enabling "trust" authentication for local connections
initdb: hint: You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb.
waiting for server to start....2025-10-07 08:55:51.068 UTC [55] LOG:  starting PostgreSQL 17.5 (Debian 17.5-1.pgdg130+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit
2025-10-07 08:55:51.072 UTC [55] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2025-10-07 08:55:51.087 UTC [58] LOG:  database system was shut down at 2025-10-07 08:55:50 UTC
2025-10-07 08:55:51.096 UTC [55] LOG:  database system is ready to accept connections
 done
server started
CREATE DATABASE


/usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/01-init.sql
CREATE ROLE
CREATE TABLE
CREATE TABLE
CREATE TABLE
GRANT


waiting for server to shut down...2025-10-07 08:55:51.293 UTC [55] LOG:  received fast shutdown request
.2025-10-07 08:55:51.297 UTC [55] LOG:  aborting any active transactions
2025-10-07 08:55:51.298 UTC [55] LOG:  background worker "logical replication launcher" (PID 61) exited with exit code 1
2025-10-07 08:55:51.299 UTC [56] LOG:  shutting down
2025-10-07 08:55:51.305 UTC [56] LOG:  checkpoint starting: shutdown immediate
2025-10-07 08:55:51.589 UTC [56] LOG:  checkpoint complete: wrote 941 buffers (5.7%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.024 s, sync=0.242 s, total=0.291 s; sync files=320, longest=0.005 s, average=0.001 s; distance=4318 kB, estimate=4318 kB; lsn=0/19251C0, redo lsn=0/19251C0
2025-10-07 08:55:51.599 UTC [55] LOG:  database system is shut down
 done
server stopped

PostgreSQL init process complete; ready for start up.

2025-10-07 08:55:51.737 UTC [1] LOG:  starting PostgreSQL 17.5 (Debian 17.5-1.pgdg130+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit
2025-10-07 08:55:51.737 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2025-10-07 08:55:51.737 UTC [1] LOG:  listening on IPv6 address "::", port 5432
2025-10-07 08:55:51.746 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2025-10-07 08:55:51.756 UTC [73] LOG:  database system was shut down at 2025-10-07 08:55:51 UTC
2025-10-07 08:55:51.765 UTC [1] LOG:  database system is ready to accept connections

• i dont see that the accounting service is interacting with the db:

otel=# select * from orderitem;
 item_cost_currency_code | item_cost_units | item_cost_nanos | product_id | quantity | order_id 
-------------------------+-----------------+-----------------+------------+----------+----------
(0 rows)

otel=# select * from shipping;
 shipping_tracking_id | shipping_cost_currency_code | shipping_cost_units | shipping_cost_nanos | street_address | city | state | country | zip_code | order_id 
----------------------+-----------------------------+---------------------+---------------------+----------------+------+-------+---------+----------+----------
(0 rows)

---

EDIT: ℹ️

I updated the accounting tag to 2.1.0, because from that version the app writes to DB, and i can see them now:

otel=# select * from orderitem;
 item_cost_currency_code | item_cost_units | item_cost_nanos | product_id | quantity |               order_id               
-------------------------+-----------------+-----------------+------------+----------+--------------------------------------
 USD                     |             209 |       949999999 | 2ZYFJ3GM2N |       10 | c129437f-a365-11f0-84a1-f648c8b7cb9a
 USD                     |            3599 |               0 | 9SIQT8TOJO |        3 | c468e416-a365-11f0-84a1-f648c8b7cb9a
 USD                     |               0 |       990000000 | HQTGWGPNH4 |        4 | c468e416-a365-11f0-84a1-f648c8b7cb9a
 USD                     |             209 |       949999999 | 2ZYFJ3GM2N |        2 | c4b22187-a365-11f0-84a1-f648c8b7cb9a
 USD                     |            3599 |               0 | 9SIQT8TOJO |       10 | c4b22187-a365-11f0-84a1-f648c8b7cb9a
 USD                     |              21 |       949999999 | L9ECAV7KIM |        3 | c66f494b-a365-11f0-84a1-f648c8b7cb9a
 USD                     |              57 |       799999999 | LS4PSXUNUM |       10 | cf8221be-a365-11f0-84a1-f648c8b7cb9a
 USD                     |             209 |       949999999 | 2ZYFJ3GM2N |        1 | d29722b5-a365-11f0-84a1-f648c8b7cb9a
 USD                     |              57 |       799999999 | LS4PSXUNUM |        4 | d9877c72-a365-11f0-84a1-f648c8b7cb9a
 USD                     |             129 |       949999999 | 1YMWWN1N4O |        3 | db465bc8-a365-11f0-84a1-f648c8b7cb9a