Categories
Mastering Development System & Network

What can I do about MailMimeParser getting this “conversion from `KOI8′ to `UCS-4LE’ is not allowed” error?

I use MailMimeParser to parse all incoming e-mails. I thought I had, after years of being annoyed by logged errors related to wrongly encoded e-mails, finally achieved a “perfectly solid” application code. And then this stuff was logged today for some incoming e-mail: iconv_strlen(): Wrong charset, conversion from `KOI8′ to `UCS-4LE’ is not allowed: … […]

Categories
Mastering Development System & Network

What tools exist for aggregating, cross referencing, and querying information from multiple sources about infrastructure assets?

When managing IT infrastructure across an organization, information about that infrastructure may exist in many different systems and on different platforms. For the sake of elaboration and future searchability, here are some of the platforms I find myself querying and cross referencing on a regular basis: Chef Ansible JAMF AWS GCP LDAP / OpenDirectory / […]

Categories
Mastering Development System & Network

Can not stop mysqld after database upgrade

I have an old Galera cluster (MySQL 5.5) that I am upgrading to Percona XtraDB (MySQL 5.7) on Ubuntu 18.04 LTS. I have successfully imported the database with xtrabackup and synced the cluster – so far so good. My problem is that I can not stop the mysqld process on the first node, the one […]

Categories
Mastering Development System & Network

how to count the open files without lsof

we have in our cluster more then 800 rhel machines – version 7.2 since lsof | wc -l take too much time ( sometimes 3-4 min ) , in order to get the current open files we want to know if there are other approach that can give the total current open files in short […]

Categories
Mastering Development System & Network

HDP cluster + data node machines + End of File Exception between local host is

we have small HDP cluster with 3 data-nodes machines HDP version is – 2.6.5 from the data-node machines we can see the following logs the main exception is about – java.io.EOFException: End of File Exception between local host is: “worker01.sys98.com/5.67.53.21”; destination host is: “master01.sys98.com”:8020; : java.io.EOFException; what this exception means ? more details: 2020-05-04 11:00:09,852 […]

Categories
Mastering Development System & Network

For SPF records do ‘a’ and ‘mx’ achieve the same result in many cases?

Example DNS Records: Type: TXT Hostname: example.com Value: returns v=spf1 a ~all Type: A Hostname: mail.example.com Value: 1.1.1.1 Type: AAAA Hostname: mail.example.com Value: 1000:1:1:1:1:1:0001 Type: MX Hostname: example.com Value: mail.example.com In the example above the SPF record uses the a mechanism. If I understand SPF correctly this means that the mail server will let through […]

Categories
Mastering Development System & Network

Kubernetes – Ingress vs Nginx with Loadbalancer

AFAIK an Ingress is just an abstraction layer to a LoadBalancer service targeting Nginx (or others) Are there features only an ingress can provide? Are there any drawbacks of using LoadBalancer + Nginx?

Categories
Mastering Development System & Network

Installed GPO Administrative Template is missing from the editor

I have this template installed: However, it fails to appear in the editor: I tried downloading and running the .MSI from here, but that didn’t help matters. This template appears to be installed correctly. How can I enable it in GPEdit?

Categories
Mastering Development System & Network

Why GCP persistent SSD disks so slow?

I have 500GB SSD Persistent disk in us-central1 on custom VM (4 vCPUs, 18 GB memory) It used for PostgreSQL 10. (Cloud SQL can not be used for some reasons: there is no way to migrate without reasonable downtime, etc) GCP promised 15k IOPS for that disk, but in real it is 5k. postgres processes […]

Categories
Linux Mastering Development

TP-Link TL-WN722N V2 and AP mode (nl80211: Driver does not support authentication/association or connect commands)

I’ve tried to use TP-Link TL-WN722N V2 (ID 2357:010c) with AP mode on both Debian and my self compiled buildroot firmware. Using recent kernel (v5.5 and v4.19) and rtl8188eu module from staging and correct firmware rtlwifi/rtl8188eufw.bin. Driver get’s loaded and possible to use in non-AP mode, but when trying to use it fails with nl80211: […]