• Génération de clés SSH : http://doc.ubuntu-fr.org/ssh#authentification_par_un_systeme_de_cles_publiqueprivee

• Commandes en vrac :

ssh -L 8000:localhost:8888 user@serveur # redirige le port distant 8888 sur le port local 8000

• Commandes en vrac :

rsync -a /path/to/source/ /path/to/destination/ # copy source to destination with overwrite
rsync -au /path/to/source/ /path/to/destination/ # ... with older files only overwrite
rsync -a --ignore-existing /path/to/source/ /path/to/destination/ # ... with no overwrite

openssl x509 -noout -text -in /etc/ssl/cert.pem # voir le contenu d'un certificat X.509 (HTTPS)

• Script mettant à jour le fichier /etc/hosts avec les adresses et noms des conteneurs Docker :

#!/bin/bash
# Depuis https://github.com/dr-co/docker-resolver/blob/master/docker-hosts.sh
 
if ! test -z "$1"; then
    exec "$@"
fi
 
set -e
 
MARKER='##- container.resolver -##'
TEMPFILE=`tempfile`
 
cleanup() {
   grep -v "$MARKER" /etc/hosts > $TEMPFILE
   cat $TEMPFILE > /etc/hosts
   rm -f $TEMPFILE
}
 
trap "cleanup; exit" EXIT INT TERM
 
while true; do
    grep -v "$MARKER" /etc/hosts > $TEMPFILE
 
    docker ps| while read line; do
        id=`echo $line|awk '{print $1}'`
        name=`echo $line|awk '{print $NF}'`
        ip=`docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' 2>/dev/null $id || true`
 
        if test -z "$ip"; then
            continue
        fi
 
        printf  "%-15s %s %-25s $MARKER\n" $ip    $id $name >> $TEMPFILE
    done
 
    EXISTS=`md5sum /etc/hosts|awk '{print $1}'`
    NEW=`md5sum $TEMPFILE|awk '{print $1}'`
 
    if ! test $NEW = $EXISTS; then
        cat $TEMPFILE > /etc/hosts
    fi
 
    sleep ${REFRESH_INTERVAL-10}
done

• Liste des paquets Alpine : https://pkgs.alpinelinux.org/packages

• Commandes en vrac :

docker-compose up --force-recreate --build -d

• Maintenance MariaDB/MySQL :

ALTER DATABASE databasename CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

• Systemctl :

systemctl list-units --failed
systemctl reset-failed

• Activation de l'accès anonyme (sur profil 'invité' sur l'instance TRU) : https://www.mantisbt.org/wiki/doku.php/mantisbt:enabling_anonymous_access