Some times I need random string, for example to use as email seperator or to use in some API. One way is to use tools like /dev/[u]random or od and other such. But they seem cubersome after I figured this out.
openssl rand <length> openssl rand 10
This alone without some parameters is not interesting thoug. You can use ‘-base64’ or ‘-hex’ to select the encoding.
So if you execute the above you will get something like this
Continue readingsupernova is an easy to use tool that helps manage multiple openstack environments.
Details –
- Name : supernova
- Arch : noarch
- Epoch : 0
- Version : 2.2.0
- Release : 2.fc24
- Size : 62 k
- Repo : @System
- From repo : fedora
- Summary : Use novaclient with multiple OpenStack nova environments the easy way
- URL : https://github.com/major/supernova
- License : ASL 2.0
- Description : supernova manages multiple nova environments without sourcing
- novarc files or mucking with environment variables.
To get started, start with installing supernova with
Continue readingTo install a VM from command line, you can use the following command. Change the required parameters as need but you need to change at-least CDROM iso image and disk-path.
virt-install \
-n myVM \
--description "Test VM" \
--os-type=Linux \
--os-variant=centos7 \
--ram=2048 \
--vcpus=2 \
--disk path=./myVM.img,bus=virtio,size=10 \
--graphics none \
--cdrom <Image installtion CDROM>.iso \
--net user
From the packages github page:
SysReporter (System Reporter) is a bash script that runs and aggregates a set of reports about its host system. The report can then be emailed to the system administrator on a daily, hourly, minutely basis.
and from dnf info
Name : sysreporter
Continue reading
Arch : noarch
Epoch : 0
Version : 3.0.4
Release : 1.fc24
Size : 17 k
Repo : @System
From repo : updates
Summary : Basic system reporter with emailing
URL : https://github.com/onesimus-systems/sysreporter
License : MIT
Description : Basic system reporter with emailing
In shell scripts if you need to get you local IP address corresponding to your hostname then you can use this command
hostname -i
Most of times I use virt-manager to manage VMs but sometimes, I have to manage VMs on other hosts over ssh when connected over VPN or while I am working remotely. GUI like virt-manager thus becomes slow, and hence I like to use cli commands and nothing is better than virsh. But here is simple script that I use sometimes to manage the VMs with CLI based menu. Hope you find it useful.
Continue readingI was trying to setup a simply webservice to reply to POST requests. Earlier this was being done in tomcat which seem a little overkill to me since I already had a webserver up and running. So, a quick c program to respond to request is all that I needed. And here is the result.
/*
* =====================================================================================
*
* Filename: Login.cpp
*
* Description:
*
* Version: 1.0
* Revision: none
* Compiler: gcc
*
* Author: Amit Agarwal (),
* Organization:
*
* == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == == =
*/
#include <stdio .h>
#include <stdlib .h>
#include <string .h>
#define MAXLEN 1024
#ifdef DBG
#define DEBUG(a,b) fprintf(stderr, a, b);
#else
#define DEBUG(a,b)
#endif
#define HEAD "n"
#define TAIL ""
int main(void)
{
char input[MAXLEN];
char * data;
char*lenstr;
long len;
printf("%s%c%cnn",
"Content-Type:text/xml;charset=iso-8859-1", 13, 10);
// len = getenv("QUERY_STRING"); // This is for GET
lenstr = getenv("CONTENT_LENGTH");
DEBUG( "Length string is %sn", lenstr);
if(lenstr == NULL || sscanf(lenstr,"%ld",&len)!=1 || len > MAXLEN)
printf("Error in invocation - wrong FORM probably.");
DEBUG( "Length is %ldn", len);
{
int count=0;
while ( count < len )
input[count++] = getchar();
input[count]='?';
DEBUG ( "Read characters = %dn", count)
}
//fprintf(stderr, "VAlue is %sn", input);
///unencode(input + 5 , input + len, data);
data = input;
DEBUG("Data value is %sn", data);
printf(HEAD);
printf("Everything else goes heren");
printf(TAIL);
fprintf(stderr, "Sent resp: tid[%s], eaid[%s], tcode[%s]n", tid, eaid, tcode);
}
</string></stdlib></stdio>
Additionally, the makefile:
Continue reading