Jason Christa's questions

On my load balancer I terminate HTTPS connections with Nginx and then proxy the request to one of the web servers which are also backed by Nginx.

On the load balancer in fastcgi_params I have:

fastcgi_param   HTTPS   $https;

On the web servers there is a site that can only be accessed by HTTPS. How can I detect if the HTTPS param is set and if not redirect to the secure version of the site?

I have Nginx listening to traffic on port 80 and proxying certain request to Apache over port 8080. I am going to set up Nginx to listen to port 443 for https traffic, but my question is how should the proxying be done now? Does the proxy to Apache need to be https or has Nginx already decoded it so I can keep sending it to Apache over port 8080. BTW, Apache is running with the least amount of modules installed possible and has currently has no SSL related modules, would I need to install any?

I am unsure is that is a Nginx or PHP-FPM setting, but long log lines are getting truncated. Is there a setting to increase the max log line length?

On a 4-core box which scenario makes the better setup:

4 uWSGI processes with a deep queue to handle requests

8 uWSGI processes with a deep queue

As many many processes as the server's memory allows with the a relatively shallow queue ?

I have about a dozen small Django sites I want to run using Nginx and uWSGI. They are on a 4-core server with 8 gigs of ram. Should each site be configured on its own socket and how can I control the total number of processes across all instances of uWSGI? If each up app has 30 processes, how can I prevent running out of ram?

I want to use Varnish to cache certain pages even in the presence of cookies. There are 3 possibilities that I need to take care of:

1. An anonymous user is viewing some page
2. A logged in user is viewing some page with light customization. These customizations are all stored in a signed-cookie and are dynamically populated by Javascript. The vary-cookie http header is not set.
3. A logged in user is viewing some page with customized data from the database. The vary-cookie http header is set.

The expected behaviors would be:

1. Cache the page. This is the most basic scenario for Varnish to handle.
2. Cache the page and do not delete the cookie because some Javascript logic needs it.
3. Never cache this page because vary-cookie is signalling the cookie contents will affect the output of this page.

I have read some docs on Varnish and I cannot tell if this is the default behavior or if there is some setup I have to do in VCL to make it happen.

With Apache's the most common HTTPS setup you need 1 IP Address per site. Does Nginx have this same limitation or can a single IP Address serve an unlimited number of HTTPS sites?

I know Erlang has the ability to run across multiple machines. Can YAWS also do this? Would there be any advantage?

How do I disable compression for PDFs using Nginx? Related question, how do I stop Adobe Reader from automatically opening the PDF, instead of saving it to the hard drive?

I have 3 servers all with the same set of mount points. On one server loses it connection to the mount fairly often and the two other servers it never does. I cannot reconnect until I reboot the server. I have tried using both a static mount and autofs to connect.

The file server is sharing the folder with this statement in /etc/exports

/var/files/images 10.176.0.0/255.255.0.0(rw,no_root_squash,no_subtree_check)

I am also sharing several other folders the same way, but this is the only one that is ever dropped.

Any ideas on what is wrong?

My /etc/fstab looks something like this:

files:/var/files/emails /var/www/emails nfs rw 0 0
files:/var/files/images /var/www/images nfs rw 0 0

My /etc/auto.master looks like this:

/net   /etc/auto.net

I am kinda lost after this. What do I need to next to get these mount point? Also there are lots of sub-directories under each mount point, I had read somewhere that there are problems with sub-directories, is this still the case?

I am running MySQL 5.0.75 on Ubuntu on a dual core machine with 8 gigs of ram. I am running a Drupal 5 and Drupal 6 site of the database.

I am sure my MySQL config is not optimal but I am wondering if there is any low hanging fruit I can address. Here is the heart of the current setup.

New current setup (original one at the bottom). This is a dedicated machine, btw:

key_buffer                      = 2G
innodb_buffer_pool_size         = 6G
innodb_additional_mem_pool_size = 16M
max_allowed_packet              = 16M
sort_buffer_size                = 128M
myisam_sort_buffer_size         = 128M
read_buffer_size                = 128M
join_buffer_size                = 128M
read_rnd_buffer_size            = 512M

thread_stack                    = 192K
thread_cache_size               = 10
thread_concurrency              = 8
innodb_thread_concurrency       = 8

table_cache                     = 2048
query_cache_limit               = 2M
query_cache_size                = 128M

Old:

key_buffer              = 16M
max_allowed_packet      = 16M
thread_stack            = 128K
thread_cache_size       = 8
query_cache_limit       = 1M
query_cache_size        = 16M
expire_logs_days        = 10
max_binlog_size         = 100M
skip-federated
default-storage-engine  = InnoDB
default-character-set   = utf8
default-collation       = utf8_general_ci

When setting up iptables you can name the port ssh which will use port 22. Is there a list of all the named ports? Specifically I need ssh, http, https and mysql.