Comprehensive Guide to Online Environment Deployment and Operations Practices

When developers rarely interact with production environments, they often only see a small part of the whole system. This guide aims to give a holistic view of online environment deployment, covering theoretical planning and practical tips.

1. Planning the user base and scale : For a small admin backend, a single server may suffice; for front‑end users, consider multi‑machine, front‑back separation, load balancing, and horizontal scalability.

2. Bandwidth estimation : Start with a shared 10 Mbps link for early stages, then adjust based on observed traffic. Public IP and DNS considerations follow naturally.

3. Database considerations : Prioritize high bandwidth, fast CPU, ample memory, and sufficient concurrent connections; avoid cutting costs on storage and choose the right type of database for the workload.

4. OS‑based vs container‑based deployment : Traditional OS deployment is simple but suffers from portability issues; container deployment (Docker) offers lightweight, repeatable environments, though it introduces new monitoring challenges.

5. Essential middleware : Typical stacks include Nginx (HTTP), Tomcat (Java), Redis (cache), Zookeeper (coordination), RabbitMQ (messaging), etc., which must be prepared before code runs.

6. Security basics : Apply firewalls, proper authorizations, and antivirus; cloud providers often simplify these steps.

7. Monitoring : System‑level monitoring (e.g., Zabbix, Grafana) and application‑level monitoring (e.g., ELK) are both essential; without monitoring, production becomes a blind spot.

8. Linux shortcuts :

• Password‑less SSH login using key pairs:

# 1. Generate a key
ssh-keygen -t rsa   # skip if already exists
# 2. Copy the public key to the target host
ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

• File transfer with scp and synchronization with rsync:

# scp example
scp /home/ol-web.war [email protected]:/www/tomcat/webapps/
# rsync example
rsync -av --delete /www/nginx/html/ [email protected]:/www/nginx/html/

• Bash auto‑completion for SSH hosts by adding entries to /root/.ssh/config and using complete -W "$(grep -v '^$|#' .ssh/config | sort -u)" ssh.

9. SaltStack quick start :

# Install master and minion
yum install salt-master salt-minion
# Configure /etc/salt/minion with master IP
master: 172.1.2.22
id: server-api-01
user: root
# Start services
systemctl start salt-master
systemctl start salt-minion
# Accept keys
salt-key -A
# Run a command on a minion
salt server-api-02 cmd.run 'lsof -i:80'

10. Cluster deployment script (bash) :

#!/bin/bash
MY_MACHINE_IP=$(ifconfig eth0 | awk -F "[: ]+" '/inet addr/{print $4}')
MACHINE_IP_LIST="172.1.2.7 172.1.3.4"
for m_ip in $MACHINE_IP_LIST; do
  if [[ $m_ip != $MY_MACHINE_IP ]]; then
    echo "- Installing apps to machine@$m_ip ..."
    scp /www/test/hello-1.0.0-SNAPSHOT.jar root@$m_ip:/www/test/
    rsync -av --delete /www/html/ root@$m_ip:/www/html/
    echo "- Install apps to machine@$m_ip done."
  fi
done

11. Docker quick guide :

# Install Docker
yum install docker
service docker start
# Pull CentOS 6 image
docker pull centos:6
# Build a custom image
cat > Dockerfile <<'EOF'
FROM centos:6
MAINTAINER oom <[email protected]>
# RUN yum install -y lsof
# EXPOSE 80
# CMD ["sh","-c","service httpd start;bash"]
EOF

docker build -t tmp_image:1.0 .
# Run container
docker run -h tmp_container -itd --name tmp_container -v /opt/docker/webapps:/www/webapp tmp_image:1.0
# Enter container
docker exec -it tmp_container bash
# Commit changes
docker commit -m 'web final.' 49d79fc19eaa tmp_image:1.2
# Save and load image
docker save > /opt/images/images_final/tmp_image.final.tar tmp_image:1.2
docker load -i /opt/images/images_final/tmp_image.final.tar

12. Custom login banner :

# Edit /etc/motd
*****************************************************************
!!! WARNING:  Welcome to production machine: service-api-01, operate with caution !!!
*****************************************************************

13. Convenient Nginx log viewing :

# Create a helper script /usr/bin/log_nginx_host
tail -f /var/log/nginx/access.log /var/log/nginx/error.log

These practical steps collectively provide a full‑stack operational roadmap for deploying, securing, monitoring, and maintaining online services.