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journal disk usage

check journal disk usage

journalctl --disk-usage

reduce journal size

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centos

#!/bin/bash

if [[ $UID -ne 0 ]]; then
    echo "please run this script with root"
    exit
fi

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use vi mode editing in psql

~/.inputrc

set editing-mode vi

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Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

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Fix rpmdb: Thread died in Berkeley DB library

error message

rpmdb: Thread/process 277623/140429100390144 failed: Thread died in Berkeley DB library
error: db3 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db3 -  (-30974)
error: cannot open Packages database in /var/lib/rpm
CRITICAL:yum.verbose.cli.yumcompletets:Yum Error: Error: rpmdb open failed

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ElasticSearch

Q: 通过 docker-compose 运行的 graylog 及 elasticsearch，如何进入 elasticsearch？

A:

sudo docker-compose exec elasticsearch bash

---

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How to Change Open Files Limit on OS X and macOS

This text is the section about OS X Yosemite (which also works for macOS Sierra) from https://docs.basho.com/riak/kv/2.1.4/using/performance/open-files-limit/#mac-os-x

The last time i visited this link it was dead (403), so I cloned it here from the latest snapshot in Archive.org's Wayback Machine https://web.archive.org/web/20170523131633/https://docs.basho.com/riak/kv/2.1.4/using/performance/open-files-limit/

Mac OS X

To check the current limits on your Mac OS X system, run:

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错误信息

ERROR 1148: The used command is not allowed with this MySQL version

解决

修改 MySQL 配置文件

my.cnf 中的 [client] ， [mysqld] 中增加 loose-local-infile=1

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#!/bin/bash

# IMPORTANT: Don't forget to logout from your Apple ID in the settings before running it!
# IMPORTANT: You will need to run this script from Recovery. In fact, macOS Catalina brings read-only filesystem which prevent this script from working from the main OS.
# This script needs to be run from the volume you wish to use.
# E.g. run it like this: cd /Volumes/Macintosh\ HD && sh /Volumes/Macintosh\ HD/Users/sabri/Desktop/disable.sh
# WARNING: It might disable things that you may not like. Please double check the services in the TODISABLE vars.

# Get active services: launchctl list | grep -v "\-\t0"
# Find a service: grep -lR [service] /System/Library/Launch* /Library/Launch* ~/Library/LaunchAgents

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import os
import re


def fix_github_link(filename):
    pattern = re.compile(
        r'\[([^\]]+)\]\(((?!http://|https://|prs://|zpl.io)[^(]+)\)', re.I
    )
    new_lines = []
    with open(filename) as fp: