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Total votes: 22

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Varnish Proxy

Silly me, a poll would not work on the new server. I forgot that with the Varnish cache proxy at the front almost all visitors arrive from the same IP address (the proxy), which means that Drupal would allocate just one vote to all (except registered and presently logged in users). With Drupal upgrade we can perhaps find polling software that overcomes this.

rpaf

You must use mod_rpaf to fix this problem that Varnish introduces.
See eg https://www.varnish-cache.org/lists/pipermail/varnish-misc/2008-September/016470.html
mod_rpaf for EL6 64bit here: http://centos.alt.ru/repository/centos/6/x86_64/mod_rpaf-0.6-2.el6.x86_64.rpm

Proxy

Thank, we will look into it. Currently, a lot of stuff other than the poll (e.g. views being counted) are not compatible with Varnish and it makes it look as though not many people visit and can participate in the site.

For sheer stats you could use

For sheer stats you could use an external (i.e. not cached by varnish) service, such as Google Analytics or run your own Piwik.

Piwik

Google Analytics is spyware, but Piwik would be a possibility (Stallman recently told me that it's good). Can it be installed on a cache proxy? I'd have to gain access to it first. Either way, this would not facilitate per-post page request count. Susan had it set up with a module, but it's no longer working correctly. In turn, rating/sorting posts by popularity is no longer possible, and that's the real downside (the front page can no longer list popular items for today).

The problem is not just that IP addresses are not unique. Some requests are never seen by the CMS and Apache.

For the non-unique addresses

For the non-unique addresses look at mod_rpaf, it was made for this situations.
Is this drupal6 or 7? With 6 varnish integration sucks from what I've seen.

See also
https://drupal.org/project/varnish
https://fourkitchens.atlassian.net/wiki/display/TECH/Configure+Varnish+3+for+Drupal+7

Agreed on Google Analytics. You can just install Piwik on the same host and tell Varnish either not to cache it or you can just set its virtualhost on a port other than 80 so it bypasses Varnish completely.

Varnish

Thanks for the pointers.

Yes, it's Drupal 6 and there are other issues that I am beginning to see, such as lack of updates from the RSS feeds around the page (I am currently investigating this, maybe it's related to a cron job or module config although I very much doubt the latter as I haven't changed configs).

Non-unique addresses could be bypassed as an issue even by writing random IP addresses, but that would enable easy poll rigging. I guess it's not essential for operation of the site, but it's a nice-to-have...

From Drupal.org: "This module provides integration between your Drupal site and the Varnish HTTP Accelerator, an advanced and very fast reverse-proxy system. Basically, Varnish handles serving static files and anonymous page-views for your site much faster and at higher volumes than Apache, in the neighborhood of 3000 requests per second."

I have had such issues with Varnish on top of WordPress and MediaWiki (pages served improperly from cache) and it all makes me wonder if removing Varnish altogether is the best way to proceed.

As for Piwik, I have never tried it before, so I will look into it.

I would keep Varnish on for

I would keep Varnish on for static files (css, js, jpeg etc) and to clean up HTTP traffic (Varnish will not forward incomplete or malformed HTTP requests to the backend, it should also be the front line against synfloods etc).

Here's a sample of what I use (test it first, I'm just beginning with Varnish myself)

director default dns {
.list = {
.port = "8080";
.connect_timeout = 5s;
.first_byte_timeout = 600s;
.between_bytes_timeout = 600s;
.max_connections = 10000;
"172.16.1.53"/32;
}
}
sub vcl_recv {
if (req.url ~ "\.(png|gif|jpg|swf|css|js)$") {
return(lookup);
}
}
sub vcl_fetch {
if (req.url ~ "\.(png|gif|jpg|swf|css|js)$") {
unset beresp.http.set-cookie;
}
if (req.restarts == 0) {
if (req.http.x-forwarded-for) {
set req.http.X-Forwarded-For =
req.http.X-Forwarded-For + ", " + client.ip;
} else {
set req.http.X-Forwarded-For = client.ip;
}
}
}

Then install mod_rpaf and make sure your Apache is listening on port 8080 and add this to /etc/httpd/conf.d/rpaf.conf:
LoadModule rpaf_module modules/mod_rpaf-2.0.so

RPAFenable On
RPAFproxy_ips 127.0.0.1 IPs_OF_THE_SERVER
RPAFsethostname On
RPAFheader X-Forwarded-For

PS: looks like drupal is messing with my comments, here's a text version http://fpaste.org/74672/raw/

Thanks

Thanks, I will look at it and into it in the weekend.

RSS feeds

The Piwik demo looks impressive, I have just given them a word of endorsement.

I am still trying to resolve some other issues we've identified.

I think I found the source of the issue above (RSS feeds). It seems like any external site access is denied by default, which helps explain why RSS feeds cannot be retrieved by the Drupal part of the site:


[root@tuxmachines ~]# wget lxer.com
--2014-02-05 04:34:37--  http://lxer.com/
Resolving lxer.com... 108.166.170.174
Connecting to lxer.com|108.166.170.174|:80... failed: Connection refused.
[root@tuxmachines ~]# wget linuxtoday.com
--2014-02-05 04:34:54--  http://linuxtoday.com/
Resolving linuxtoday.com... 70.42.23.121
Connecting to linuxtoday.com|70.42.23.121|:80... failed: Connection refused.

Looks like a firewall issue

Looks like a firewall issue at the first glance.

Firewall

Nux wrote:

Looks like a firewall issue at the first glance.

Yes, it was a simply issue to tackle. It works now.

Pageview count and polls

I'll have a look and see if configuration can solve not just the polling issue but also pageview count. The site of this module is down and it seems like it may require configuration on the cache server too.

More in Tux Machines

Security Leftovers

  • efail: Outdated Crypto Standards are to blame
    I have a lot of thoughts about the recently published efail vulnerability, so I thought I'd start to writeup some of them. I'd like to skip all the public outrage about the disclosure process for now, as I mainly wanted to get into the technical issues, explain what I think went wrong and how things can become more secure in the future. I read lots of wrong statements that "it's only the mail clients" and the underlying crypto standards are fine, so I'll start by explaining why I believe the OpenPGP and S/MIME standards are broken and why we still see these kinds of bugs in 2018. I plan to do a second writeup that will be titled "efail: HTML mails are to blame". I assume most will have heard of efail by now, but the quick version is this: By combining a weakness in cryptographic modes along with HTML emails a team of researchers was able to figure out a variety of ways in which mail clients can be tricked into exfiltrating the content of encrypted e-mails. Not all of the attack scenarios involve crypto, but those that do exploit a property of encryption modes that is called malleability. It means that under certain circumstances you can do controlled changes of the content of an encrypted message. [...] Properly using authenticated encryption modes can prevent a lot of problems. It's been a known issue in OpenPGP, but until know it wasn't pressing enough to fix it. The good news is that with minor modifications OpenPGP can still be used safely. And having a future OpenPGP standard with proper authenticated encryption is definitely possible. For S/MIME the situation is much more dire and it's probably best to just give up on it. It was never a good idea in the first place to have competing standards for e-mail encryption. For other crypto protocols there's a lesson to be learned as well: Stop using unauthenticated encryption modes. If anything efail should make that abundantly clear.
  • Comcast Leaked Customer Wi-Fi Logins in Plaintext, Change Your Passcode Now
    A Comcast Xfinity website was leaking Wi-Fi names and passwords, meaning now is a good time to change your Wi-Fi passcode. The site, intended to help new customers set up new routers, could easily be fooled into revealing the location of and password for any customer’s Wi-Fi network. A customer ID and a house or apartment number was all would-be attackers needed to get full access to your network, along with your full address.
  • Update Fedora Linux using terminal for latest software patches
  • Patch for New Spectre-Like CPU Bug Could Affect Your Performance
  • container_t versus svirt_lxc_net_t

today's howtos

Red Hat News

  • “Ultimate Private Cloud” Demo, Under The Hood!
    At the recent Red Hat Summit in San Francisco, and more recently the OpenStack Summit in Vancouver, the OpenStack engineering team worked on some interesting demos for the keynote talks. I’ve been directly involved with the deployment of Red Hat OpenShift Platform on bare metal using the Red Hat OpenStack Platform director deployment/management tool, integrated with openshift-ansible. I’ll give some details of this demo, the upstream TripleO features related to this work, and insight around the potential use-cases.
  • Discover the possibilities of hybrid cloud during a joint virtual event with Red Hat & Microsoft [Ed: [Ed: When Red Hat pus Microsoft executives at top positions inside Red Hat...]
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    In 2016, we surveyed our customer base on their use of OpenStack in production, getting a pulse-check on the top considerations, expectations, and benefits of a Red Hat OpenStack Platform deployment. With 2018 marking five years of Red Hat OpenStack Platform, we checked back in with our customers to see if their experiences or expectations of OpenStack have changed. Our survey found:
  • Red Hat CEO Jim Whitehurst On How He Plans To Win The Container Market
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    Juniper Networks and Red Hat have tightened their integration efforts in a move to help ease enterprise adoption of cloud-native platforms and bolster their own offerings against the likes of VMware and Cisco. The latest platform integration includes the Red Hat OpenStack Platform; Red Hat’s OpenShift Container Platform running as a platform-as-a-service (PaaS) on top of or next to the OpenStack platform depending on deployment architecture; and Juniper’s Contrail Enterprise Multi-Cloud platform running as the networking and security layer to unify those together. This integration is designed as a managed system to help deploy and run applications and services on any virtual machine (VM), container platform, and any cloud environment.
  • Red Hat OpenStack HCI Targets Telco Hybrid Cloud, 5G Deployments
    Red Hat today rolled out a hyperconverged infrastructure (HCI) platform based on OpenStack compute and Ceph storage. The new product targets service providers looking to deploy virtual network functions (VNFs) and 5G technologies on top of open source software. Launched at this week’s OpenStack Summit, the Red Hat Hyperconverged Infrastructure for Cloud combines Red Hat OpenStack Platform 13 and Red Hat Ceph Storage 3 into one product. Red Hat says it is the largest contributor to both open source projects.
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Today in Techrights