luqo33's questions

These are my NGINX processes:

root@ip-192-168-0-12:/etc/nginx/sites-enabled# ps aux | grep nginx
root      4758  0.0  0.0 102208  2780 ?        Ss   Jul25   0:00 nginx: master process /usr/sbin/nginx
www-data  5585  0.0  0.0 105868  7048 ?        S    Jul26  18:12 nginx: worker process
www-data  5586  0.0  0.0 105868  6972 ?        S    Jul26  18:07 nginx: worker process
www-data  5587  0.0  0.0 102208  2444 ?        S    Jul26   0:07 nginx: cache manager process
root     13190  0.0  0.0  12828  1008 pts/2    S+   20:13   0:00 grep --color=auto nginx

Now let's stop NGINX:

root@ip-192-168-0-12:/etc/nginx/sites-enabled# service nginx stop
nginx stop/waiting

Let's see if the processes still exist (omg they're still there):

root@ip-192-168-0-12:/etc/nginx/sites-enabled# ps aux | grep nginx
root      4758  0.0  0.0 102208  2780 ?        Ss   Jul25   0:00 nginx: master process /usr/sbin/nginx
www-data  5585  0.0  0.0 105868  7048 ?        S    Jul26  18:12 nginx: worker process
www-data  5586  0.0  0.0 105868  6972 ?        S    Jul26  18:08 nginx: worker process
www-data  5587  0.0  0.0 102208  2444 ?        S    Jul26   0:07 nginx: cache manager process
root     13230  0.0  0.0  12828  1008 pts/2    S+   20:16   0:00 grep --color=auto nginx

Then if I run service nginx start, the grep command would report exactly the same output - one master process, two workers and a cache manager.

What is happening here? Why cannot I just stop NGINX?

I'd like to resolve a domain name somedomain.com to a CNAME (AWS load balancer, e.g. some-balancer-1213231237.ap-southeast-2.elb.amazonaws.com), but only locally.

What I mean to achieve is that whenever I try to visit somedomain.com, I want to be served by the above mentioned load-balancer - this should only be limited to my own computer.

It's not possible to achieve this by editing /etc/hosts as in there only A records (IP addresses) can be mapped. I read somewhere that dnsmasq would be the most robust solution to achieve this. However, the documentation is very unclear about how this can be achieve. I'd appreciate your advice and perhaps a piece of config with an example. Thanks!

How can I display a value of an option for a GluserFS server. GlusterFS Documentation talks only about setting option values:

gluster volume set, e.g. gluster volume set test-volume performance.cache-size 256MB

There is no mention of inspecting option values currently in use. There were also several people asking similar question with no answer - is that really possible to not be able to display an option value in GlusterFS cli?

I've had very good performance results using NGINX microcaching.

However, I'm still not sure how to best handle server responses that have the Set-Cookie header.

• Can responses from the origin server with Set-Cookie header be cached by NGINX at all?

If the answer is negative and Set-Cookie responses should always by-pass the caching layer, this would have very negative consequences on performance.

For example, when you visit an avarege e-commerce site running WooCommerce, theses cookies would be set upon your first visti:

Set-Cookie:PHPSESSID=xxyy

Set-Cookie:wp_woocommerce_session_xx=yy

Should Set-Cookie responses be excluded from caching this would mean that cached content would never be served for a first visit in any e-commerce store.

Also, when browsing products on a WooCommerce store, the plugin would set woocommerce_recently_viewed=xxxx cookie. woocommerce_recently_viewed cookie would be updated on each product view so all subsequent requests to other products would cause the server to include the Set-Cookie header.

• Can caching be enabled in such scenario at all?

Some default caching configuration that I'm using with my NGINX includes this:

  if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
    set $skip_cache 1;
  }

If I include woocommerce_recently_viewed cookie in the list, the cache would be by-passed most of the time.

• What's the best practice handling caching and cookies in a scenario like this?

Let's assume that I have this folder structure:

|-Home    
 |-Subdir
  |-Subsubdir
 |-Subdir

Each directory includes a bunch of files.

Now I want to apply the following permissions:

• All directories - 750
• All files in these directories - 644

Is it possible to do it in one go?

I have a linux server instance hosted by RunAbove where I log in as an 'admin' user using an ssh key.

I need to change the mysql root password on the server manually. I'm following directions given here

The problem I have is that I log in to the server as an 'admin' user while the 'mysqld' process is owned by 'mysql' user (this process below):

Feb21  54:48 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysql/error.log --pid-file=/var/run/mysqld/mysqld.pid

I need to send kill signal to mysqld.pid, but I'm not able to do it even if I execute it with sudo as an 'admin' user.

RunAbove allows me to ssh into the only server as 'admin'.

What are my options here?