Kubernetes: gateway: start services via docker-systemctl-replacement

[un-def]

• ensures all enabled services are running
• acts as a proper init (PID 1) - reaps zombies, handles signals, etc.

[un-def]

Before:

USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           1  0.0  0.0   2892  1768 ?        Ss   10:46   0:00 /bin/sh -c apt-get update && apt-get install -y sudo wget openssh-server nginx python3.10-venv libaugeas0 && wget https://raw.githubusercontent.com/gdraheim/docker-systemctl-replacement/b18d67e521f0d1cf1d705dbb8e0416bef23e377c/files/docker/systemctl3.py -O /usr/bin/systemctl && chmod a+rx /usr/bin/systemctl && python3 -m venv /root/certbotvenv/ && /root/certbotvenv/bin/pip install certbot-nginx && ln -s /root/certbotvenv/bin/certbot /usr/bin/certbot && sed -i "s/.*PasswordAuthentication.*/PasswordAuthentication no/g" /etc/ssh/sshd_config && useradd -mUG sudo ubuntu && echo 'ubuntu ALL=(ALL:ALL) NOPASSWD: ALL' | tee /etc/sudoers.d/ubuntu && mkdir -p /run/sshd /home/ubuntu/.ssh && chmod 700 /home/ubuntu/.ssh && echo 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDY1ZwYMRd9ji0JG7ggCLD/FpaoMGdYDEoA+cfzl7o4hqJYH271jTUclXE71CGseoxVMiIGzCNCRiTSDbe1xsCy0c7aNbRKxSR/53c6+4MlLy+NhNSWtR5IkaSjHE51U/n5YtixNeDDSsb7ZEAE1GGLgJmsFdgXSPdb3z3mvmvmsJi/1IiCVQT3DIPl9/NqRePuDUNDdhiYVKaXj3mGmlZ8D4N2cJKC4KQbnNT4Y6wsetghRCxB8DHyM2O1bzJh4wVjv3Fd991LpsUyoKic3MVDcvVD3XWRHvELcgILNiJp8LS/0unAbFlTuxmUGfZEc15K6j92YgHFdCZWs89zmfSz dstack' > /home/ubuntu/.ssh/authorized_keys && chmod 600 /home/ubuntu/.ssh/authorized_keys && chown -R ubuntu:ubuntu /home/ubuntu/.ssh && rm -rf /etc/ssh/ssh_host_* && ssh-keygen -A > /dev/null && /usr/sbin/sshd -p 22 -o PermitUserEnvironment=yes && su ubuntu -c 'mkdir -p /home/ubuntu/dstack && python3 -m venv /home/ubuntu/dstack/blue && python3 -m venv /home/ubuntu/dstack/green && /home/ubuntu/dstack/blue/bin/pip install '"'"'dstack-gateway @ https://dstack-gateway-downloads.s3.amazonaws.com/stgn/dstack_gateway-6596-py3-none-any.whl'"'"' && sudo /home/ubuntu/dstack/blue/bin/python -m dstack.gateway.systemd install --run' && sleep infinity
root        4540  0.0  0.0  15440  5616 ?        Ss   10:46   0:00 sshd: /usr/sbin/sshd -p 22 -o PermitUserEnvironment=yes [listener] 0 of 10-100 startups
ubuntu      4652  0.0  0.0   2892  1672 ?        Ss   10:47   0:00 /bin/sh /home/ubuntu/dstack/start.sh
ubuntu      4655  1.0  0.4 157696 71640 ?        Sl   10:47   0:00 /home/ubuntu/dstack/blue/bin/python3 /home/ubuntu/dstack/blue/bin/uvicorn dstack.gateway.main:app
root        4661  0.0  0.0   2792  1504 ?        S    10:47   0:00 sleep infinity

After:

USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           1  0.1  0.2 112680 33080 ?        Ss   10:59   0:00 /usr/bin/python3 /usr/bin/systemctl default
ubuntu      4631  0.0  0.0   2892  1696 ?        Ss   10:59   0:00 /bin/sh /home/ubuntu/dstack/start.sh
ubuntu      4634  4.4  0.4 157708 71904 ?        Sl   10:59   0:00 /home/ubuntu/dstack/blue/bin/python3 /home/ubuntu/dstack/blue/bin/uvicorn dstack.gateway.main:app
root        4644  0.0  0.0  55344  6016 ?        Ss   10:59   0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
root        4650  0.0  0.0  15440  9484 ?        Ss   10:59   0:00 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups
www-data    4652  0.0  0.0  55960  5816 ?        S    10:59   0:00 nginx: worker process
www-data    4653  0.0  0.0  55960  5816 ?        S    10:59   0:00 nginx: worker process
www-data    4654  0.0  0.0  55960  5816 ?        S    10:59   0:00 nginx: worker process
www-data    4655  0.0  0.0  55960  5816 ?        S    10:59   0:00 nginx: worker process