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Feature/lab2 #54

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d46b3ae
lab01
vIadimirsoIovev Jun 12, 2026
b862370
Add lab2 submission
vIadimirsoIovev Jun 12, 2026
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9 changes: 8 additions & 1 deletion app/gateway/main.py
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -338,7 +338,14 @@ async def _charge():
raise HTTPException(e.response.status_code, "Payment failed")
except Exception as e:
log.error(f"payment error: {e}")
raise HTTPException(502, "Payment service unavailable")
return JSONResponse(
status_code=503,
content={
"error": "payments_unavailable",
"message": "Payment service is temporarily down. Your reservation is held - try again in a few minutes.",
"reservation_id": reservation_id
}
)

# 2. Confirm reservation in events.
try:
Expand Down
90 changes: 90 additions & 0 deletions submissions/lab2.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,90 @@
### Lab2 Report
### Task 1
1.
```
user@MacBook-Air SRE-Intro % docker images | grep app
WARNING: This output is designed for human readability. For machine-readable output, please use --format.
app-events:latest 1a2c40214eaa 260MB 57.6MB U
app-gateway:latest f3b92a071eb8 239MB 52.3MB U
app-payments:latest cda4501637ef 236MB 51.8MB U
```
2.
```
ser@MacBook-Air SRE-Intro % docker history app-gateway --no-trunc --format "table {{.CreatedBy}}\t{{.Size}}"

CREATED BY SIZE
CMD ["uvicorn" "main:app" "--host" "0.0.0.0" "--port" "8080"] 0B
EXPOSE [8080/tcp] 0B
COPY main.py . # buildkit 24.6kB
RUN /bin/sh -c pip install --no-cache-dir -r requirements.txt # buildkit 28.7MB
COPY requirements.txt . # buildkit 12.3kB
WORKDIR /app 8.19kB
CMD ["python3"] 0B
RUN /bin/sh -c set -eux; for src in idle3 pip3 pydoc3 python3 python3-config; do dst="$(echo "$src" | tr -d 3)"; [ -s "/usr/local/bin/$src" ]; [ ! -e "/usr/local/bin/$dst" ]; ln -svT "$src" "/usr/local/bin/$dst"; done # 16.4kB
RUN /bin/sh -c set -eux; savedAptMark="$(apt-mark showmanual)"; apt-get update; apt-get install -y --no-install-recommends dpkg-dev gcc gnupg libbluetooth-dev libbz2-dev libc6-dev libdb-dev libffi-dev libgdbm-dev liblzma-dev libncursesw5-dev libreadline-dev libsqlite3-dev libssl-dev make tk-dev uuid-dev wget xz-utils zlib1g-dev ; wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz"; echo "$PYTHON_SHA256 *python.tar.xz" | sha256sum -c -; wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc"; GNUPGHOME="$(mktemp -d)"; export GNUPGHOME; gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys "$GPG_KEY"; gpg --batch --verify python.tar.xz.asc python.tar.xz; gpgconf --kill all; rm -rf "$GNUPGHOME" python.tar.xz.asc; mkdir -p /usr/src/python; tar --extract --directory /usr/src/python --strip-components=1 --file python.tar.xz; rm python.tar.xz; cd /usr/src/python; gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; ./configure --build="$gnuArch" --enable-loadable-sqlite-extensions --enable-optimizations --enable-option-checking=fatal --enable-shared $(test "${gnuArch%%-*}" != 'riscv64' && echo '--with-lto') --with-ensurepip ; nproc="$(nproc)"; EXTRA_CFLAGS="$(dpkg-buildflags --get CFLAGS)"; LDFLAGS="$(dpkg-buildflags --get LDFLAGS)"; LDFLAGS="${LDFLAGS:-} -Wl,--strip-all"; arch="$(dpkg --print-architecture)"; arch="${arch##*-}"; case "$arch" in amd64|arm64) EXTRA_CFLAGS="${EXTRA_CFLAGS:-} -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer"; ;; i386) ;; *) EXTRA_CFLAGS="${EXTRA_CFLAGS:-} -fno-omit-frame-pointer"; ;; esac; make -j "$nproc" "EXTRA_CFLAGS=${EXTRA_CFLAGS:-}" "LDFLAGS=${LDFLAGS:-}" ; rm python; make -j "$nproc" "EXTRA_CFLAGS=${EXTRA_CFLAGS:-}" "LDFLAGS=${LDFLAGS:-} -Wl,-rpath='\$\$ORIGIN/../lib'" python ; make install; cd /; rm -rf /usr/src/python; find /usr/local -depth \( \( -type d -a \( -name test -o -name tests -o -name idle_test \) \) -o \( -type f -a \( -name '*.pyc' -o -name '*.pyo' -o -name 'libpython*.a' \) \) \) -exec rm -rf '{}' + ; ldconfig; apt-mark auto '.*' > /dev/null; apt-mark manual $savedAptMark; find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' | awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); printf "*%s\n", so }' | sort -u | xargs -rt dpkg-query --search | awk 'sub(":$", "", $1) { print $1 }' | sort -u | xargs -r apt-mark manual ; apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; apt-get dist-clean; export PYTHONDONTWRITEBYTECODE=1; python3 --version; pip3 --version # buildkit 43.5MB
ENV PYTHON_SHA256=639e43243c620a308f968213df9e00f2f8f62332f7adbaa7a7eeb9783057c690 0B
ENV PYTHON_VERSION=3.13.14 0B
ENV GPG_KEY=7169605F62C751356D054A26A821E680E5FA6305 0B
RUN /bin/sh -c set -eux; apt-get update; apt-get install -y --no-install-recommends ca-certificates netbase tzdata ; apt-get dist-clean # buildkit 4.99MB
ENV PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 0B
# debian.sh --arch 'arm64' out/ 'trixie' '@1781049600' 109MB
```
So, the biggest layer is the Debian OS base because every container requires a lightweight operating system environment

3.
```
user@MacBook-Air SRE-Intro % docker inspect app-events-1 --format '{{.Name}} {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}'

/app-events-1 172.19.0.5
user@MacBook-Air SRE-Intro % docker inspect app-gateway-1 --format '{{.Name}} {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}'

/app-gateway-1 172.19.0.6
user@MacBook-Air SRE-Intro % docker inspect app-payments-1 --format '{{.Name}} {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}'

/app-payments-1 172.19.0.2
```
4.
```
user@MacBook-Air SRE-Intro % docker inspect app-payments-1 --format '{{range .Config.Env}}{{println .}}{{end}}'

PAYMENT_LATENCY_MS=0
PAYMENT_FAILURE_RATE=0.0
PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
GPG_KEY=7169605F62C751356D054A26A821E680E5FA6305
PYTHON_VERSION=3.13.14
PYTHON_SHA256=639e43243c620a308f968213df9e00f2f8f62332f7adbaa7a7eeb9783057c690

```
5.
```
user@MacBook-Air SRE-Intro % docker exec app-gateway-1 whoami
root
user@MacBook-Air SRE-Intro % docker exec app-gateway-1 python3 -c "
import urllib.request
print(urllib.request.urlopen('http://payments:8082/health').read().decode())
"
{"status":"healthy","failure_rate":0.0,"latency_ms":0}
```
6.
```
gateway-1 | {"time":"2026-06-12 14:28:40,530","level":"INFO","service":"gateway","msg":"HTTP Request: POST http://events:8081/events/1/reserve \"HTTP/1.1 200 OK\""}
gateway-1 | INFO: 192.168.65.1:45465 - "POST /events/1/reserve HTTP/1.1" 200 OK

events-1 | {"time":"2026-06-12 14:28:40,527","level":"INFO","service":"events","msg":"Reserved 1 tickets for event 1: 2d93c04e-a066-464a-9898-c63d7f82da62"}
events-1 | INFO: 172.19.0.6:42312 - "POST /events/1/reserve HTTP/1.1" 200 OK
```
7.
```
user@MacBook-Air app % docker network ls | grep app

5f3e521bb5c0 app_default bridge local
user@MacBook-Air app % docker network inspect app_default --format '{{range .Containers}}{{.Name}}: {{.IPv4Address}}{{"\n"}}{{end}}'

app-redis-1: 172.19.0.4/16
app-payments-1: 172.19.0.2/16
app-events-1: 172.19.0.5/16
app-postgres-1: 172.19.0.3/16
app-gateway-1: 172.19.0.6/16

user@MacBook-Air app %
```