Questions tagged [availability]
The availability tag has no usage guidance.
35
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Find packages that cause docker daemon to restart before apt upgrade?
I have an ubuntu-server (versions 18 & 20) and want to update all packages on my machine except for the docker daemon.
After pinning the docker daemon version and running the apt upgrade, the ...
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Which VM Availability Zone is used on Azure if no availability option is selected?
I find the documentation on Azure Availability Zones a bit lacking on details about high availability, so I hope someone here knows these details about some undocumented behaviour.
What happens when ...
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vote
0
answers
146
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replication VMs in availability set
I have kind of a stupid question. I am starting to learn about MS Azure Cloud and planning on using an availability set in Azure. I understand that I need at least 2 VMs in my availability set.
...
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697
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Why may AWS t3.micro in Singapore respond slower than t2.nano in N. Virginia from Bangladesh?
I have a t2.nano instance running in North-Virginia availability zone (us-east-1) for almost 1 year.
In hope of reducing latency, I just have deployed the created AMI of that instance to a t3.micro ...
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2
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208
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What availability is needed for an E-Mail server to not lose messages?
Setting up an E-Mail server, I wonder, what if it goes down. Do I need a redundant setup in order to not lose incoming mails? Or would it suffice to make sure it doesn't go offline for longer than, ...
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Will having 2 web app instances ensure availability incase of WPA problems?
I have an azure web app (S2 app Service plan) that is set to autoscale but has a min instance count of 1. As it mostly idles, the real instance count also is 1 almost all of the time.
Last week "...
- 166
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925
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Reliable way to check server availability
I am using scheduler/API to scan target machines for Vulnerabilities(Using Nessus). But before the scan starts, I want to check if the servers are available or not for scan. I understand from this ...
- 103
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When an ISP is DDoSed, will its NOC have Internet access?
When an ISP is hit by a huge DDoS attack and its data plane is severely congested, will its Network Operations Center (NOC) have alternative Internet access?
I'm curious what would be the industry ...
- 21
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282
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Courier IMAP server and availability
i manage a little mail server based on Ubuntu Server, with:
exim4
courier imap server
spamassassin
clamav
to serve 20 users mailbox.
It works well, but i'd like to put in service a second server with ...
4
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3
answers
560
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Availability at risk due to one offline Domain Name Server?
A domain can have plenty of name servers registered at there domain registrar. The name servers are picked randomly and not like expected primary first, secondary second and so on.
Knowing that, ...
- 444
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1k
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F5 LTM The time between a node going down and a health check failing
Simple question but I couldn't find an answer online.
Suppose the following scenario plays out: The node to receive traffic next becomes unresponsive before a health check can be initiate when it ...
- 231
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3k
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EC2 Bandwidth between two instance in same availability zone
I'm using an Apache proxy on one server in front of tomcat on a different server.
What is the the bandwidth between the two EC2 instances if they are in the same availability zone? Does this have ...
- 3,114
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29
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Interchanging remote hosting with computer hosting vs. displaying availability state of computer hosting on remote website [closed]
Recently, I bought a domain kkziomek.eu. The root domain is hosted on a remote hosting. I added a subdomain "komputer.kkziomek.eu" which is hosted on my computer. To do that I created a subdomain, ...
- 103
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86
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azure availability set second VM shuts down first VM
I've got two Ubuntu VMs in one availability set. When I start the second VM it takes a few minutes and the first VM stopps.
I'm a bit helpless (beginner) here. Any advice would be very apprechiated.
- 101
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Unable to configure port mapping for Azure availability set in the new portal
Where is the option to configure port mappings in the new Microsoft Azure portal (http://portal.azure.com)?
- 735
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250
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NewRelic Availability Monitoring of Third Party Service
Background
NewRelic offers availability monitoring whereby you can specify a ping URL for an application and have NewRelic send HTTP GET requests to that URL and GREP the response for selected text, ...
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Amazon EC2 instance was not available for few minutes (amazon showed that everything ok)
Few minutes ago my amazon Ec2 instance was unavailable for a few minutes. During this time neither I was able to connect to web-site with http, nor I was able to ssh to it.
Also I was not able to ...
- 965
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135
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Website not available everywhere
Today I noticed my website http://mint-nachhilfe.ch/ was down, but other people (located in different networks) said it looks up from there. When I came home, I double-checked, and I can really reach ...
1
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1
answer
84
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Using Dynamic DNS for server reboots
Basically, I want all the traffic to go to one server while the other reboots. Here's the environment:
Two or more VPS servers.
Same datacenter, but no internal ip or lan, and no shared ip.
I was ...
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210
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Choosing a database management system to maximize availability and scalability [closed]
If I was planning on choosing a database management system and know that the data needs to be available as close to 100% as possible and that it needs to scale as well as possible, is there a "best" ...
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How to check if redis master is OK?
On the documentation, they advice the monitor command. But it has a 50% performance penalty for the whole system, and how should I do that ? Whatching the ouput using SSH until I don't see anything ?
...
- 399
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2
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127
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Immortal application
(TL;DR: last paragraph)
I'm running an online service and have thusfar been doing offline backups and simple monitoring to achieve resilience and availability.
Resilience is rather manual but I'm ...
- 111
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1
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3k
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Determine availability zone of AWS IP address
I'm currently using Heroku (which uses AWS) and my program needs to communicate with my own EC2 instance. I've made my EC2 instance in the same Region as Herokus', however, in order to reduce costs ...
- 3,173
107
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14
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125k
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Is Ping a reliable way to check if a server is available?
In my application I am pinging a server and waiting for a response. I am using this to determine whether the server is available and responsive or not.
Is this a reliable way of determining ...
- 1,102
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0
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849
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Exchange 2003 to 2010 migration: Can I remove free/busy public folder once all users are moved?
Now that all my mailboxes are on the 2010 server, can I remove the schedule+free/busy public folder? I am having scheduling synchronization issues, and I believe it may be at fault. All clients are ...
- 21
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5
answers
583
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Check availability of my websites
How can I check the availability of websites from hosted by company?
Ping the server and checking if the services for IIS or Apache/Tomcat
is not enough. I want to see if the sites are responsive, if ...
- 23
4
votes
4
answers
512
views
System Monitoring Redundancy
I consult in a small business environment where I have two HyperV hosts (with <10 VMs) + a couple other servers.
I recently had an issue where one of the HyperV hosts had a CPU issue and it came ...
- 1,669
1
vote
1
answer
599
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Swapping db's to increase availability during database update
I have a SQL server database with data supplied from a 3rd party. They supply a tool to update the database data weekly. The tool is pretty old and uses ODBC. The update can take several hours. In ...
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4
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370
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ngnix reverse proxy [closed]
Most of the configuration and example I've seen out there, the backend server are either on the same machine or the same network network. Has any body done this with backend servers located in ...
user25751
8
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3
answers
1k
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How to manage communication during application downtime?
I've had a lot of experiences lately with application downtime, from both vendors and my own applications. This has got me thinking and as best I can google there isn't really a good or standard way ...
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54
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Fixing the accesibility of a webserver
I have my server, which is hosted in datacenter, and there is a website and a database installed on this server. DNS servers for the domain name are the default ones of the domain name registrator.
...
- 213
1
vote
2
answers
110
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http server connectivity puzzle
I have been seeing some strange connection issue in the production environment.
The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin).
One instance ...
- 1,504
2
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2
answers
3k
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Lifetime of IIS worker process or AppDomain
I have an ASP.NET app hosted in IIS, and I have automatic worker process recycling/shutdown disabled. I'd like to have a rough idea of how long the app has been running continuously without being re-...
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6
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4k
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uptime.exe crashing on Windows Server 2008
Can anyone get uptime.exe to run either the /s or /p:n switches on a Windows Server 2008 box without crashing?
I realise it's a NT tool and no longer supported, but it worked fine on 2003. I've ...
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2k
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How can I tell which package updates will require a reboot or service restart?
One of our boxes is running Ubuntu 8.04 LTS. Most Ubuntu package upgrades are trivial and don't affect availability much. How do I tell which packages are going to cause an outage before applying them?...
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