Re: [CentOS] ansible tutorials for beginners?

[nschehovin--- via CentOS]

Ralf,

There was a nice presentation on Ansible at a Northern Virginia Linux Users 
Group (NOVALUG) meeting last year. Here is a link to a youtube video of the 
presentation.

 https://www.youtube.com/watch?v=gEfcfnxI0ew




Ed




On Sunday, June 16, 2019, 11:53:49 PM EDT, Ralf Prengel 
 wrote: 





Hallo,
has anyone here good links abut ansible tutorials for beginners?

Thanks
Ralf

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Re: [CentOS] Postfix and choice of RBL

[Bowie Bailey]

On 6/17/2019 1:08 PM, Alexander Dalloz wrote:
> Am 17.06.2019 um 16:50 schrieb Bowie Bailey:
>> On 6/17/2019 6:20 AM, Nicolas Kovacs wrote:
>>> Hi,
>>>
>>> I'm managing several mail servers running CentOS 7, Postfix and Dovecot.
>>> SpamAssassin is filtering mail nicely, but I'm considering using RBL
>>> (blacklists) to take some load off the servers.
>>>
>>> General question to those of you who use RBL. Which lists do you
>>> recommend using?
>>
>> The best free blacklist that I'm aware of is zen.spamhaus.org.  I've been 
>> using it as
>> a blacklist on my server for years without any problems.
>>
>> More info: https://www.spamhaus.org/zen/
>
> Spmhaus isn't free per se.
>
> https://www.spamhaus.org/organization/dnsblusage/

Right.  I haven't looked at blacklists in a while and I'm nowhere near their 
limits
for free use, so I forgot that they charge for higher volume users.

-- 
Bowie

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Re: [CentOS] systemd-sleep

[mark]

Tate Belden wrote:
> https://www.freedesktop.org/software/systemd/man/systemd-sleep.conf.html
>
> On Mon, Jun 17, 2019 at 9:44 AM mark  wrote:
>
>
>> I found that one of my users' workstation is, for some reason, running
>> systemd-sleep. I cannot find, anywhere on the system. system-sleep.conf
>> (or systemd-sleep.conf), nor do I find systemctl status
>> system[d]-sleep.
>>
>> How can I turn this thing off, other than renaming
>> /usr/lib/systemd/systemd-sleep?
>>
Please don't top post.

Thanks - I didn't read it carefully enough, because there is *no* conf
file with commented out settings.

I'm also underwhelmed that the correct way to turn it off is for me to
make a symlink, rather than systemctl disable systemd-sleep.

 mark

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Re: [CentOS] Postfix and choice of RBL

[Alexander Dalloz]

Am 17.06.2019 um 19:10 schrieb Alexander Dalloz:
Additionally, I've got Postgrey enabled, which does a really good job 
of weeding out the spambot desktops and such.


Instead of using reject_rbl_client the better choice is to use 
postscreen within Postfix. That enables the admin to set weighted 
scores, not rejecting based on a single RBL.


Alexander


Forgot to mention that when using postscreen you can drop Postgrey as 
postscreen does the same job.


Alexander

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Re: [CentOS] Postfix and choice of RBL

[Alexander Dalloz]

Am 17.06.2019 um 18:09 schrieb Mike Burger:

On 2019-06-17 06:20, Nicolas Kovacs wrote:

Hi,

I'm managing several mail servers running CentOS 7, Postfix and Dovecot.
SpamAssassin is filtering mail nicely, but I'm considering using RBL
(blacklists) to take some load off the servers.

General question to those of you who use RBL. Which lists do you
recommend using?


In my "reject_rbl_client" lines, I've been using:

  - hil.habeas.com
  - sbl-xml.spamhaus.org
  - bl.spamcop.net

And in my reject_rhsbl_sender line, I have:

  - ds.rfc-ignorant.org

Additionally, I've got Postgrey enabled, which does a really good job of 
weeding out the spambot desktops and such.


Instead of using reject_rbl_client the better choice is to use 
postscreen within Postfix. That enables the admin to set weighted 
scores, not rejecting based on a single RBL.


Alexander



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Re: [CentOS] Postfix and choice of RBL

[Alexander Dalloz]

Am 17.06.2019 um 16:50 schrieb Bowie Bailey:

On 6/17/2019 6:20 AM, Nicolas Kovacs wrote:

Hi,

I'm managing several mail servers running CentOS 7, Postfix and Dovecot.
SpamAssassin is filtering mail nicely, but I'm considering using RBL
(blacklists) to take some load off the servers.

General question to those of you who use RBL. Which lists do you
recommend using?


The best free blacklist that I'm aware of is zen.spamhaus.org.  I've been using 
it as
a blacklist on my server for years without any problems.

More info: https://www.spamhaus.org/zen/


Spmhaus isn't free per se.

https://www.spamhaus.org/organization/dnsblusage/

Alexander



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Re: [CentOS] Postfix and choice of RBL

[Mike Burger]

On 2019-06-17 06:20, Nicolas Kovacs wrote:

Hi,

I'm managing several mail servers running CentOS 7, Postfix and 
Dovecot.

SpamAssassin is filtering mail nicely, but I'm considering using RBL
(blacklists) to take some load off the servers.

General question to those of you who use RBL. Which lists do you
recommend using?


In my "reject_rbl_client" lines, I've been using:

 - hil.habeas.com
 - sbl-xml.spamhaus.org
 - bl.spamcop.net

And in my reject_rhsbl_sender line, I have:

 - ds.rfc-ignorant.org

Additionally, I've got Postgrey enabled, which does a really good job of 
weeding out the spambot desktops and such.


--
Mike Burger
http://www.bubbanfriends.org

"It's always suicide-mission this, save-the-planet that. No one ever 
just stops by to say 'hi' anymore." --Colonel Jack O'Neill, SG1

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Re: [CentOS] systemd-sleep

[Tate Belden]

https://www.freedesktop.org/software/systemd/man/systemd-sleep.conf.html

On Mon, Jun 17, 2019 at 9:44 AM mark  wrote:

> I found that one of my users' workstation is, for some reason, running
> systemd-sleep. I cannot find, anywhere on the system. system-sleep.conf
> (or systemd-sleep.conf), nor do I find systemctl status system[d]-sleep.
>
> How can I turn this thing off, other than renaming
> /usr/lib/systemd/systemd-sleep?
>
>  mark
>
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[CentOS] systemd-sleep

[mark]

I found that one of my users' workstation is, for some reason, running
systemd-sleep. I cannot find, anywhere on the system. system-sleep.conf
(or systemd-sleep.conf), nor do I find systemctl status system[d]-sleep.

How can I turn this thing off, other than renaming
/usr/lib/systemd/systemd-sleep?

 mark

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Re: [CentOS] Postfix and choice of RBL

[mark]

Bowie Bailey wrote:
> On 6/17/2019 6:20 AM, Nicolas Kovacs wrote:
>>
>> I'm managing several mail servers running CentOS 7, Postfix and
>> Dovecot.
>> SpamAssassin is filtering mail nicely, but I'm considering using RBL
>> (blacklists) to take some load off the servers.
>>
>>
>> General question to those of you who use RBL. Which lists do you
>> recommend using?
>
> The best free blacklist that I'm aware of is zen.spamhaus.org.  I've been
> using it as a blacklist on my server for years without any problems.
>
> More info: https://www.spamhaus.org/zen/
>
I have an issue with a lot of the blacklists - manitu, the one this list
uses. My issue is that IMO, the method they use to blacklist hasn't been
good for almost 20 years: instead of blocking a specific domain, they
blacklist the mailserver.

Now, in Days of Yore, when people were connected by modem to an ISP,
maybe. But most ISPs were devoured by large companies, such as my hosting
provider, Hostmonster. They have a few mailservers, which they loadbalance
with... and they host, I have personally been told, millions of domains.

The first time I ran into this, around 2000, I was unable to email a
friend in Canada, because they were blacklisting RoadRunner, which was the
ONLY WAY hundreds of thousands of folks in Chicago sent email, that having
eaten all the other ISPs.

Now, blocking my mailserver, which is a unifiedlayer somethingorother,
because a few of those burner domains that people buy, send spam, etc
from, and blow off, means I, and many others, are screwed.

Getting through to a hosting provider support to do something with the
blacklister means
a) proving I'm the account owner
b) telling them what's wrong, and
c) convincing the call taker that I really do know what I'm talking about,
and they do have to push it to tier 2 support, or
d) escalating to get a manager, who'll push it.

And like that's going to happen in an hour. Try a day or five.

This is why I dislike blacklists, the way they're currently run.

   mark

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Re: [CentOS] Postfix and choice of RBL

[Bowie Bailey]

On 6/17/2019 6:20 AM, Nicolas Kovacs wrote:
> Hi,
>
> I'm managing several mail servers running CentOS 7, Postfix and Dovecot.
> SpamAssassin is filtering mail nicely, but I'm considering using RBL
> (blacklists) to take some load off the servers.
>
> General question to those of you who use RBL. Which lists do you
> recommend using?

The best free blacklist that I'm aware of is zen.spamhaus.org.  I've been using 
it as
a blacklist on my server for years without any problems.

More info: https://www.spamhaus.org/zen/

-- 
Bowie
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Re: [CentOS] ansible tutorials for beginners?

[Earl Ramirez]

On Mon, 2019-06-17 at 05:53 +0200, Ralf Prengel wrote:
> Hallo,
> has anyone here good links abut ansible tutorials for beginners?
> 
> Thanks
> Ralf
> 

You can check out these webinars

https://www.ansible.com/resources/webinars-training/introduction-to-ansible


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[CentOS] Postfix and choice of RBL

[Nicolas Kovacs]

Hi,

I'm managing several mail servers running CentOS 7, Postfix and Dovecot.
SpamAssassin is filtering mail nicely, but I'm considering using RBL
(blacklists) to take some load off the servers.

General question to those of you who use RBL. Which lists do you
recommend using?

Cheers,

Niki
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