diff --git a/Dockerfile b/Dockerfile
index 5fb8d51..31f9249 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,6 +8,7 @@ RUN apt-get update && apt-get install -y \
   nano \
   netcat \
   nginx \
+  pandoc \
   ssh \
   vim \
   && rm -rf /var/lib/apt/lists/*
@@ -19,10 +20,13 @@ ENV TZ=Europe/Paris
 
 # SSH server
 RUN mkdir /run/sshd
-CMD ["netcat", "-lp", "5000", "-e", "/root/http/http_bash.sh"]
+CMD ["sh", "-c", "while true ; do netcat -lp 5000 -e /root/http_bash.sh ; done"]
 
 # Nginx conf
-COPY ./default /etc/nginx/sites-enabled/default
+COPY ./nginx-server.conf /etc/nginx/sites-enabled/default
+
+# Bash HTTP website
+COPY ./http_bash.sh ./http_bash.sh
 
 # Entrypoint
 COPY ./entrypoint.sh ./entrypoint.sh
diff --git a/docker-compose.yml b/docker-compose.yml
index ed9292b..eeb273b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,6 +6,6 @@ services:
             - ./config:/root/config
             - ./home_eleves:/home
             - ./exercices:/root/exercices
-            - ./http:/root/http
+            - ./exercices/html:/var/www/html
         network_mode: "host"
         restart: "unless-stopped"
diff --git a/exercices/gen_enonces.sh b/exercices/gen_enonces.sh
index 2bc1ac6..03e6bcc 100755
--- a/exercices/gen_enonces.sh
+++ b/exercices/gen_enonces.sh
@@ -209,4 +209,4 @@ for i in {1..8} ; do
 done
 
 
-pandoc --from=markdown --to=html --output=$html/$eleve.html --table-of-contents --columns=80 $enonces/ex*.txt
+pandoc --standalone --from=markdown --to=html --output=$html/$eleve.html --table-of-contents --columns=80 $enonces/ex*.txt
diff --git a/exercices/gen_seed.sh b/exercices/gen_seed.sh
index a1d80ee..1070f5c 100755
--- a/exercices/gen_seed.sh
+++ b/exercices/gen_seed.sh
@@ -34,15 +34,25 @@ if echo $DIR | grep -v /$ > /dev/null ; then DIR=$DIR/ ; fi
 
 mkdir -p $DIR$USER ; 
 
-find $root -type d | shuf | head -n $folders > $DIR$USER/folders.seed
+if [[ ! -s $DIR$USER/folders.seed ]] ; then
+    find $root -type d | shuf | head -n $folders > $DIR$USER/folders.seed
+    echo folders
+fi
 
-find $root -type f | shuf | head -n $files > $DIR$USER/files.seed
+if [[ ! -s $DIR$USER/files.seed ]] ; then
+    find $root -type f | shuf | head -n $files > $DIR$USER/files.seed
+    echo files
+fi
 
-cat haddock.list | shuf | head -n $filenames > $DIR$USER/filenames.seed
+if [[ ! -s $DIR$USER/filenames.seed ]] ; then
+    cat haddock.list | shuf | head -n $filenames > $DIR$USER/filenames.seed
+    echo names
+fi
 
-if [[ -s $DIR$USER/ints.seed ]] ; then rm $DIR$USER/ints.seed ; fi
-
-for i in $(seq 1 $ints) ; do
-    echo $((3 + $RANDOM % 13)) >> $DIR$USER/ints.seed
-done
+if [[ ! -s $DIR$USER/ints.seed ]] ; then 
+    for i in $(seq 1 $ints) ; do
+        echo $((3 + $RANDOM % 13)) >> $DIR$USER/ints.seed
+    done
+    echo ints
+fi
 
diff --git a/exercices/init.sh b/exercices/init.sh
index 317070f..ecd7376 100755
--- a/exercices/init.sh
+++ b/exercices/init.sh
@@ -1,14 +1,23 @@
 #!/bin/bash
-if [ "$#" -ne 1 ] ; then
-    echo -e "usage : $0 <FILE>\n\tGenerate the exercice for a class.\nFILE must be a list containing identifiers (names) and passwords for each student, separated by a '='.\n\tEx:\n\t\tJean-claude-dus=mot_de_passe\n\t\tJean-dus-claude=passe_de_mot\n\t\tClaude-jean-dus=azerty\n\nThis file must be executed from the same folder as the files gen_arbo.sh, gen_seed.sh and gen_enonces.sh.\nFolders will be created in this directory, containing the exercices, their correction and the grades of the students."
+if [ "$#" -ne 1 && "$#" -ne 2 ] ; then
+    echo -e "usage : $0 <FILE> [USER]\n    Generate the exercice for a class.\nFILE must be a list containing identifiers (names) and passwords for each student, separated by a '='.\n    Ex:\n        Jean-claude-dus=mot_de_passe\n        Jean-dus-claude=passe_de_mot\n        Claude-jean-dus=azerty\nIf a USER is provided, init will only be run for that user (useful to add a student mid-class, reset a session when something went horribly wrong, or if a student finished early and wants to start over.\n\nThis file must be executed from the same folder as the files gen_arbo.sh, gen_seed.sh and gen_enonces.sh.\nFolders will be created in this directory, containing the exercices, their correction and the grades of the students."
     exit 1;
 fi
 
-cat $1
-
 home=/home
+
+#Little debug option for one of the devs. If we forgot to remove it before deployment, feel free to erase this line.
+if [ $USER = karsaell ] ; then home=root ; fi
+
 names=$(cut -d '=' -f 1 $1)
 
+if [ "$#" -eq 2 ] ; then
+    names=$(grep $2 $1 | cut -d '=' -f 1)
+    if [ -z $names ] ; then
+        echo "Error : no user named $2 found in $1"
+        exit 1
+    fi
+fi
 
 for name in $names ; do
     ./gen_arbo.sh $home/$name $name
diff --git a/http/http_bash.sh b/http_bash.sh
similarity index 78%
rename from http/http_bash.sh
rename to http_bash.sh
index bdb4b85..e8974d2 100755
--- a/http/http_bash.sh
+++ b/http_bash.sh
@@ -58,9 +58,23 @@ serve_static_string() {
    send_response_ok_exit <<< "$1"
 }
 
+where () {
+    h="$(dirname "$0")"
+    # If $h isnt absolute, prepend working dir
+    if [[ ! "${h:0:1}" = "/" ]] ; then
+        h="$(pwd)/$(dirname "$0")"
+    fi
+    h="$(realpath "$h")"
+    echo "$h"
+}
+
 main () {
+    # Request uri must be a relative path from the exercices/corriges directory
     [ -x "$REQUEST_URI" ] || [ ! -d "$REQUEST_URI" ] || fail_with 404
-    serve_static_string "$(basename "$REQUEST_URI" | cut -d '.' -f 1) : $(sh "$REQUEST_URI" 2>&1 && echo Ok || echo 'Non validé')"
+    here="$(where)"
+    path="$(realpath "$here/exercices/corriges/$REQUEST_URI")"
+    [[ "$path" = "$here"* ]] || fail_with 404
+    serve_static_string "$(basename "$path" | cut -d '.' -f 1) : $(bash "$path" 2>&1 && echo Ok || echo 'Non validé')"
 }
 
 # Request-Line HTTP RFC 2616 $5.1
diff --git a/default b/nginx-server.conf
similarity index 78%
rename from default
rename to nginx-server.conf
index 80b5bdf..84732c5 100644
--- a/default
+++ b/nginx-server.conf
@@ -2,7 +2,7 @@ server {
 	listen 80 default_server;
 	listen [::]:80 default_server;
 
-	root /root/exercices/html;
+	root /var/www/html;
 
 	index index.html;
 
@@ -12,10 +12,11 @@ server {
 		# First attempt to serve request as file, then
 		# as directory, then fall back to displaying a 404.
 		try_files $uri $uri/ =404;
+        add_header Content-Type 'text/html;';
         autoindex on;
 	}
 
-    location ~ /.sh$ {
+    location ~ \.sh$ {
         proxy_pass http://127.0.0.1:5000;
     }
 
diff --git a/readme.md b/readme.md
index 9c898b3..0c383fe 100644
--- a/readme.md
+++ b/readme.md
@@ -18,7 +18,7 @@ Chaque élève a un dossier perso dans `/home` dans lequel il peut se connecter
 ## Génération de l’activité
 ```
 cd exercices
-./init.sh
+./init.sh ../config/passwords.txt
 ```
 
 ## Énoncés des exercices
@@ -29,7 +29,7 @@ Si un·e élève a saccagé ses fichiers, il est possible de les réparer en lan
 $username est son nom d’utilisateurice.
 ```
 cd exercices
-./init.sh $username
+./init.sh ../config/passwords.txt $username
 ```
 
 ## Ajouter des élèves en cours de route