Instalar os pacotes:

# apt-get install libapache2-svn libapache-dbi-perl libapache2-mod-perl2 libdbd-mysql-perl libauthen-simple-ldap-perl

Copiar o arquivo de configuração do Remine:

# mkdir /usr/share/perl/5.14/Apache
# cp /usr/share/redmine/extra/svn/Redmine.pm /usr/share/perl/

Habilitar os módulos:

a2enmod ssl
a2enmod dav
a2enmod dav_svn
a2enmod dav_fs
a2enmod rewrite
a2enmod headers

Criar o arquivo /etc/apache2/conf.d:

# /svn location for users
PerlLoadModule Apache::Redmine
<Location /svn>
    DAV svn
    SVNParentPath "/var/www/svn" 
    Order deny,allow
    Deny from all
    Satisfy any
 
    PerlAccessHandler Apache::Authn::Redmine::access_handler
    PerlAuthenHandler Apache::Authn::Redmine::authen_handler
    AuthType Basic
    AuthName "Projectwerk Subversion Repository" 
 
    #read-only access    
    <Limit GET PROPFIND OPTIONS REPORT>
        Require valid-user
        # Allow from [my server ip]
        Allow from 127.0.0.1
        # Allow from another-ip
        Satisfy any
    </Limit>
    # write access
    <LimitExcept GET PROPFIND OPTIONS REPORT>
        Require valid-user
    </LimitExcept>
    ErrorDocument 404 default
 
    # sqlconnection
    RedmineDSN "DBI:mysql:dbname=redmine_default;host=localhost" 
    RedmineDbUser "redmine" 
    RedmineDbPass "xxxx" 
</Location>

Instalando redmine e SGBD:

# apt-get install mysql-server
# apt-get install redmine redmine-mysql thin

Configurando o thin:

# thin config --config /etc/thin2.1/redmine.yml --chdir /usr/share/redmine --environment production --socket /var/run/redmine/sockets/thin.sock --daemonize --log /var/log/thin/redmine.log --pid /var/run/thin/redmine.pid --user www-data --group www-data --servers 1
# mkdir -p /var/run/redmine/sockets
# chown www-data.www-data /var/run/redmine/sockets

Configurando o nginx:

/etc/nginx/conf.d:

redmine

upstream redmine_thin {
    server unix:/var/run/redmine/sockets/thin.0.sock;
}

/etc/nginx/sites-available/:

redmine

server {
    listen 80;
    server_name projetos.tic.ufrj.br;
    return 301 https://projetos.tic.ufrj.br$request_uri;
} 
 
server {
    listen 443 ssl; 
    server_name projetos.tic.ufrj.br;
 
    ## Keep alive timeout set to a greater value for SSL/TLS.
    keepalive_timeout 75 75;
 
    access_log /var/log/nginx/redmine.access.log;
    error_log /var/log/nginx/redmine.error.log;
 
    ssl_certificate /etc/ssl/certs/secure.projects.example.com-cert.pem;
    ssl_certificate_key /etc/ssl/private/perusio.com-key.pem;
 
    ## Strict Transport Security header for enhanced security. See
    ## http://www.chromium.org/sts.
    add_header Strict-Transport-Security "max-age=7200";
 
    root /usr/share/redmine/public;
    index index.html;
 
    location / {
        try_files $uri @thin;
    }
 
    ## All static files will be served directly.
    location ~* ^.+\.(?:css|js|jpe?g|gif|htc|ico|png|html)$ {
        access_log off;
        expires 30d;
        ## No need to bleed constant updates. Send the all shebang in one
        ## fell swoop.
        tcp_nodelay off;
        ## Set the OS file cache.
        open_file_cache max=3000 inactive=120s;
        open_file_cache_valid 45s;
        open_file_cache_min_uses 2;
        open_file_cache_errors off;
    }
 
    ## Support for favicon. Return an 1x1 transparent GIF if it doesn't
    ## exist.
    location = /favicon.ico {
        expires 30d;
        try_files /favicon.ico @empty;
    }
 
    ## Return an in memory 1x1 transparent GIF.
    location @empty {
        expires 30d;
        empty_gif;
    }
 
    ## Location
    location @thin {
        proxy_http_version 1.1;
        proxy_set_header Connection '';
        proxy_pass http://redmine_thin;
    }
 
    ## Protect .git files.
    location ^~ /.git {
        return 404;
    }
 
} 

Reiniciar os servidores:

# systemctl start thin
# systemctl start nginx

Fonte: https://github.com/macournoyer/thin/