any syslog recommendation?

any syslog recommendation ?
im looking for a software which can analyze several servers syslog,
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logwatch is the bets one for single and local server, how about ypu have to manage 100 linux servers and checking messages log file, ftp and ... take lots of time.
a single software connect to all these servers (local or external) and give you a short conclusion of what happen on last 24 hours
Look into ELK: https://www.elastic.co/what-is/elk-stack
It works great for what you seem to be looking for.
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any update ?
Industry standard is to pull the logs and analyze them on a server or cluster built just for analyzing logs. Elastic ELK stack will enable you to do that and it's free. You should not do your log analysis on systems that customers are using as it takes away valuable resources that be you should be using for customers and takes away from resources customers can use.

So the first thing you should do is update the configuration of your servers to forward servers logs to a central log server or cluster then process them from your log server stack. This will give you the flexibility to determine how much you want to analyze how long you want to keep the logs and you can scale the log stack to your likings without having to also make changes to your money making client servers.

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There are also some other things that may be of interest to you for metrics, SIEM, etc. I would also make sure you only have these admin only services/sites setup to be accessible only over a private VPN that you and your employees and contractors have access too.

https://www.elastic.co/products/log-monitoring

https://www.elastic.co/products/infr...ure-monitoring

https://logz.io/blog/server-log-analysis/

https://logz.io/learn/complete-guide-elk-stack/
You're going to have to check out Splunk (personal favorite) or Elastic Search. They can take a bit to setup. Basically you have to forward your logs to another server (your log server), then create indicies and tell it how to look for and display your data.
I too had a similar requirement to centrally log journals and get notified in case of errors and warnings.
You can look at logstash, fluentd solutions.

I wanted something simple and easy, without having to install extra binaries. I ended up writing a python program to take json output of journalctl and send it to NoSQL backend via API.
You can actually do the same and push to Elasticsearch.

If you want something perfect, then fluentd might be a good option.
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ElasticSearch + dedicated log server, where all the servers are storing (or duplicating) their logs. And I won't advise to disable local logs as there is always a chance to miss something if it was a network failure or anything similar.
As you mention syslog, then you should forward all logs to a centralized rsyslog machine - see https://www.rsyslog.com/

Otherwise, +1 for ELK. You can setup on your own or use the hosted service by elastic.co.
Logz.io is also great.

Lots and lots of services and tools to choose: new relic, datadog etc.. Depends on budget  These tools can get expensive....
If you wanted to do actions (blocking, notification, etc) along with central logging, ossec might be a good option -- once you configure it to not harass you about every little thing.