环境：
- 操作系统为ubuntu13.**版本，非长期支持版。
- 安装目录：/opt/redmine-2.3.1-0/
- 所有者用户：root
安装过程：
1. 备份2.3.1数据库
sudo /opt/redmine-2.3.1-0/mysql/bin/mysqldump -u bitnami -p bitnami_redmine > /home/erick/redmineback/2.3.1backup.sql
2. 备份2.3.1的配置文件和files目录（上传文件）
cp /opt/redmine-2.3.1-0/apps/redmine/htdocs/config/database.yml /home/erick/redmineback/
cp /opt/redmine-2.3.1-0/apps/redmine/conf/redmine.conf /home/erick/redmineback/
cp /opt/redmine-2.3.1-0/apps/phpmyadmin/conf/phpmyadmin.conf /home/erick/redmineback/
cp /opt/redmine-2.3.1-0/apache2/conf/httpd.conf /home/erick/redmineback/
mkdir /home/erick/redmineback/files
cp /opt/redmine-2.3.1-0/apps/redmine/htdocs/files/* /home/erick/redmineback/files
cp /opt/redmine-2.3.1-0/apps/redmine/htdocs/public/favicon.ico /home/erick/redmineback/
3. 下载并安装最新redmine bitnami3.2.2安装包，目录与之前的区分开
/opt/redmine-3.2.2-0/
4. 备份3.2.2的数据库
sudo /opt/redmine-3.2.2-0/mysql/bin/mysqldump -u bitnami -p bitnami_redmine > /home/erick/redmineback/3.2.2backup.sql
5. 删除并创建3.2.2的数据库
sudo /opt/redmine-3.2.2-0/mysql/bin/mysql -u bitnami -p
DROP DATABASE bitnami_redmine;
CREATE DATABASE bitnami_redmine;
quit
6. 用2.3.1的备份数据恢复到3.2.2的数据库中
通过phpmyadmin的导入功能实现
7. 迁移3.2.2的数据库
cd /opt/redmine-3.2.2-0/apps/redmine/htdocs
sudo /opt/redmine-3.2.2-0/ruby/bin/ruby bin/rake db:migrate RAILS_ENV=production
8. 修改3.2.2的配置文件
设置apache，启用gogs,修改apache参数文件:
/opt/redmine-3.2.2-0/apache2/conf/httpd.conf
在最后增加以下配置信息：
<VirtualHost *:80>
DocumentRoot "/opt/redmine-3.2.2-0/apps/redmine/htdocs/public/"
ServerName qa.yncic.com
ServerAlias qa.yncic.com
</VirtualHost>
<VirtualHost *:80>
ServerAdmin webmaster@domain.tld
ServerName git.yncic.com
ProxyRequests Off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPass / http://localhost:3000/
ProxyPassReverse / http://localhost:3000/
</VirtualHost>
9. 拷贝files目录到3.2.2中
sudo cp -r /opt/redmine-2.3.1-0/apps/redmine/htdocs/files/* /opt/redmine-3.2.2-0/apps/redmine/htdocs/files/
sudo chown -R daemon:daemon /opt/redmine-3.2.2-0/apps/redmine/htdocs/files/*
10. 拷贝icon图标
sudo cp /opt/redmine-2.3.1-0/apps/redmine/htdocs/public/favicon.ico /opt/redmine-3.2.2-0/apps/redmine/htdocs/public/favicon.ico