If we are interested in checking which TCP ports a host has open, we can scan it using nmap, using the parameter -PS. $ nmap -PS 192.168.1.121 Starting Nmap 7.80 ( https://nmap.org ) at 2022-09-10 12:36 CEST Nmap scan report for Guard.mdemarc.com (192.168.1.121) Host is up (0.0029s latency). Not shown: 996 filtered ports PORT STATE […]
Starting with Docker
What is Docker and why can it be more useful than a virtual machine? To understand Docker, many people make the mistake of comparing it to the concept of a virtual machine. At first glance, they may seem the same, but in reality, the concepts are quite different. In a VM, we have the […]
Reverse SSH tunnel
Today, I found a problem at work that led me to write this article. The issue is that I need to migrate data from a machine in production to a new environment that will consist of two machines. The client is interested in implementing a DR solution, but they did not consider the necessary access […]
Isilon Protection Policy
In Isilon, we can define a level of data protection by specifying the maximum number of disks or nodes that can fail in a cluster through the “Protection policy“. For example, in the following example, we have defined the protection limit up to a failure of 3 disks or a node. storage-i001% isi storagepool nodepools […]
Postgres notes
Users List users postgres=# \du List of roles Role name | Attributes | Member of ———————+————————————————————+———– database | | {} database_ajuda | | {} postgres | Superuser, Create role, Create DB, Replication, Bypass RLS | {} postgres_exporter | | {} It can also be done through a query. postgres=# SELECT u.usename AS “Role name”, postgres-# […]
How to know if vomume is ASM or not
The simplest way to find out if a disk is ASM from the console or not is running the following command. blkid | grep asm If we have an ASM disk, the output would look like this: [root@Oracle-DB05~]# blkid | grep asm /dev/mapper/ASM_data3p1: LABEL=”DATA003″ TYPE=”oracleasm” /dev/mapper/ASM_data4p1: LABEL=”DATA004″ TYPE=”oracleasm” /dev/mapper/ASM_data2p1: LABEL=”DATA002″ TYPE=”oracleasm” /dev/mapper/ASM_fra3p1: LABEL=”FRA003″ TYPE=”oracleasm” /dev/mapper/ASM_data5p1: […]
Isilon Notes
List job status summarized isilon-i000-1% isi sync reports list –reports-per-policy 1 Policy Name Job ID Start Time End Time Action State ———————————————————————————- REP_vci0-esc001 3726 2019-07-11T11:30:01 2019-07-11T11:30:11 run finished REP_vci1-lleg001 3726 2019-07-11T11:35:01 2019-07-11T11:35:16 run finished REP_vci1-esc001 3725 2019-07-11T11:40:01 2019-07-11T11:40:13 run finished REP_vci2-lleg001 3726 2019-07-11T11:45:01 2019-07-11T11:45:16 run finished REP_vci2-esc001 3726 2019-07-11T11:20:01 2019-07-11T11:20:14 run finished REP_vci3-lleg001 3688 2019-07-11T11:25:01 […]