shk's questions

I have simple erlang web application with cowboy web server. I'm trying to launch it behind nginx reverse proxy.

My /etc/nginx/sites-available/default:

server {
        listen 9090;

        default_type text/html;

        location /my_app {
          proxy_pass http://localhost:8001/;
        }
}

If i'm openning http://localhost:9090/my_app it's ok, i'm seeing my html page from my web application. But if i'm adding Content-Type: text/html header to the cowboy response i'm getting 204 instead 200.

Thank you.

I need munin plugin with 2 lines in/out.

What args i must put in my plugin like this graph view:

I need to lines and zero line.

Thank you.

I have server with ubuntu server operation system, i have some applications on it which works with network. With an increase in network traffic, CPU context swithching and interrupts are also increases 40 - 60 k per/second. What i must fix kernel optimizaion, NIC optimization maybe or what?

UPDATE

First of all thank you for you answers. I have 8 CPU. My cat /proc/interrupts

          CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       
  0:    6938741    6966303    6934714    6881839    6895772    6883046    6952545    6909960   IO-APIC-edge      timer
  1:          0          0          1          0          0          1          1          1   IO-APIC-edge      i8042
  8:          0          1          0          0          0          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   acpi
 12:          0          1          0          0          1          1          2          1   IO-APIC-edge      i8042
 16:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2
 17:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
 18:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb4
 19:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb5
 21:         21         23         22         21         23         21         23         21   IO-APIC-fasteoi   ipmi_si
 22:          3          5          6          6          2          5          3          6   IO-APIC-fasteoi   uhci_hcd:usb6, hpilo
 23:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   radeon
 41:     275729        555        587        549     275294        563        583        600   PCI-MSI-edge      cciss0
 42:          2          0          2          1          1          1          2          1   PCI-MSI-edge      cciss1
 46:   31600723   31636789   31668261   31721092   31643480   31719981   31650284   31692948   PCI-MSI-edge      eth0
NMI:          0          0          0          0          0          0          0          0   Non-maskable interrupts
LOC:   42250721   42318004   19164905   20751945   32012455   25335850   15889990   15935085   Local timer interrupts
SPU:          0          0          0          0          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0          0          0          0          0   Performance monitoring interrupts
IWI:          0          0          0          0          0          0          0          0   IRQ work interrupts
RES:  104005816   96594384   40149041   34906154   77175689   55787936   28455228   25633969   Rescheduling interrupts
CAL:     204860     543304    1318717    1176681     431344     876239    1046465    1257472   Function call interrupts
TLB:     308034     229917     230598     299353     362103     478994     256456     212019   TLB shootdowns
TRM:          0          0          0          0          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0          0          0          0          0   Machine check exceptions
MCP:       1263       1263       1263       1263       1263       1263       1263       1263   Machine check polls
ERR:          0
MIS:          0

I have very big:

 RES:  104150407   96747853   40291367   35052019   77327041   55940217   28595113   25775538   Rescheduling

from which it depends?

My network cards: bnx2: Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.1.6 (Mar 7, 2011)

UPDATE 2

I made: ethtool -k eth0

And see: large-receive-offload: off

How can i make on it?

Thank you.

I have server with Linux ubuntu 3.0.0-12-server #20-Ubuntu x86_64x operation system.

I run erlang/otp application on it. Under high load i see that i server has very high context switches and interupts.

I have NIC:

[    1.720140] bnx2: Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.1.6 (Mar 7, 2011)

If i do ifconfig:

Interrupt:16 Memory:f6000000-f6012800

How can i increase this value: Interrupt:16

Thank you.

How do I grant a PHP script access to read and write log files in the /var/log/ and /var/ directories?

I have domain name at dyndns. I want to create zone at xname.org. I set up zone for my domain name, and now i try to configure it. In A record field we have 2 parameters - Name and IP. Name it's my domain name, and what IP adress i must input here?

Thank you

I have domain name at dyndns.com and set at home smtp server. I try send mail to other servers but get error:

550 We cannot accept email from IP 92.46.76.192 without a DNS PTR record. Contact your ISP/HSP to set up PTR record for your server.

How can i set PTR record for this domain?

Thank you.

I have pop3 server and 2 domain names. In pop3 session how nca i know what the user's domain connected?

We have:

C: user name

S: OK+

C: pass password

S: OK+

We have only user name. Where can i get user domain name?

Thank you.

I bind dyndns host to my local computer. My router - Zyxel P-600. In my router settings in DynDns tab i set my accaunt dyndns settings. I 110 port forward. Then i set up pop3 server.

I try to connect with telnet to my server. But telnet: Unable to connect to remote host: Connection refused

nslookup mydomain:

Server: 192.168.1.1 Address: 192.168.1.1#53

Non-authoritative answer: Name: shk.dyndns-mail.com Address: 95.59.96.111

What's wrong? Maybe i must something else?

Thank you.

Plese, explain me, how two smtp servers communicate betwen each. When i write e-mail and send it to other user, my client communicate with my smtp server by smtp protocol with ehlo/mail from/ rcpt to/ and etc... When this mail get my smtp server from client what happens next? How my smtp server send mail to other smtp server?

Thank you.

If the mail receive with attachments and mail storage in the server - Maildir. How attachment set in Maildir format?

For example: I user maildir for incoming message in my server. I got 1 message with attachment, I set this message in /user/new dir, where must i set attachment for this message?

Thank you.

I have pop3 local server. I want to use mail storage - Maildir format. And i have question:

Maildir structure:

       Maildir
tmp      cur     new

Is it for one user? If i have 2 users in my pop3 server, how can pop3 server explain to mail client where first user mailbox and where second user mailbox?

Thank you.

I run smtp and pop3 server in local computer. I have domain name and set up MX record for this domain. Please, explain me anybody how smtp server name depend at MX record? And where must i specify the MX record in smtp server config?

Thank you.

I have domain for example: example.com, I registered it, then i create dns record in zoneedit.com When i ping example.com, it's ping 127.0.0.1 it's ok.

Then i create mail forwarding from [email protected] to existing mail adress in gmail.com, When i try to send message to [email protected], nothing messages in gmail adress.

Why?

Thank you.