Performance and Reliability

services: ssh-server: build: context: ./docker dockerfile: Dockerfile container_name: libssh-test-server hostname: ssh-test network_mode: "host" restart: unless-stopped ulimits: nofile: soft: 65536 hard: 65536 nproc: soft: 32768 hard: 32768 healthcheck: test: ["CMD", "nc", "-z", "localhost", "2222"] interval: 5s timeout: 3s retries: 10

FROM alpine:latest # Install OpenSSH server RUN apk add --no-cache openssh-server openssh-keygen # Create user RUN adduser -D -s /bin/sh user && \ echo "user:12345" | chpasswd # Setup SSH directories RUN mkdir -p /run/sshd /home/user/.ssh && \ chmod 700 /home/user/.ssh && \ chown -R user:user /home/user/.ssh # Generate host keys RUN ssh-keygen -A # Create sshd_config with high limits RUN echo 'Port 2222' > /etc/ssh/sshd_config && \ echo 'PermitRootLogin no' >> /etc/ssh/sshd_config && \ echo 'PasswordAuthentication yes' >> /etc/ssh/sshd_config && \ echo 'PubkeyAuthentication yes' >> /etc/ssh/sshd_config && \ echo 'AuthorizedKeysFile /home/user/.ssh/authorized_keys' >> /etc/ssh/sshd_config && \ echo 'MaxStartups 1000:30:2000' >> /etc/ssh/sshd_config && \ echo 'MaxSessions 1000' >> /etc/ssh/sshd_config && \ echo 'LoginGraceTime 30' >> /etc/ssh/sshd_config && \ echo 'ClientAliveInterval 30' >> /etc/ssh/sshd_config && \ echo 'ClientAliveCountMax 3' >> /etc/ssh/sshd_config && \ echo 'UseDNS no' >> /etc/ssh/sshd_config && \ echo 'MaxAuthTries 10' >> /etc/ssh/sshd_config # Create test files directory and generate test files RUN mkdir -p /test-files && \ echo "Small test file content" > /test-files/small.txt && \ dd if=/dev/urandom of=/test-files/medium.bin bs=1024 count=1024 2>/dev/null && \ dd if=/dev/urandom of=/test-files/large.dat bs=1024 count=10240 2>/dev/null && \ chmod 644 /test-files/* # Copy SSH keys COPY test-keys/*.pub /tmp/keys/ RUN cat /tmp/keys/*.pub > /home/user/.ssh/authorized_keys 2>/dev/null || true && \ chmod 600 /home/user/.ssh/authorized_keys && \ chown user:user /home/user/.ssh/authorized_keys && \ rm -rf /tmp/keys EXPOSE 2222 # Start sshd in foreground CMD ["/usr/sbin/sshd", "-D", "-e"]